diff --git a/Pipfile.lock b/Pipfile.lock
index 72003f6..81c71b2 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -3,19 +3,6 @@
         "hash": {
             "sha256": "d9bdd87cc3c2eca8cd358c9dd09cef04ffa979a355c2e253a7dd8d2793b900f9"
         },
-        "host-environment-markers": {
-            "implementation_name": "cpython",
-            "implementation_version": "3.6.2",
-            "os_name": "posix",
-            "platform_machine": "x86_64",
-            "platform_python_implementation": "CPython",
-            "platform_release": "18.2.0",
-            "platform_system": "Darwin",
-            "platform_version": "Darwin Kernel Version 18.2.0: Mon Nov 12 20:24:46 PST 2018; root:xnu-4903.231.4~2/RELEASE_X86_64",
-            "python_full_version": "3.6.2",
-            "python_version": "3.6",
-            "sys_platform": "darwin"
-        },
         "pipfile-spec": 6,
         "requires": {},
         "sources": [
@@ -29,86 +16,88 @@
     "default": {
         "lxml": {
             "hashes": [
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-                "sha256:241fb7bdf97cb1df1edfa8f0bcdfd80525d4023dac4523a241907c8b2f44e541",
-                "sha256:99fdce94aeaa3ccbdfcb1e23b34273605c5853aa92ec23d84c84765178662c6c",
+                "sha256:0dd6589fa75d369ba06d2b5f38dae107f76ea127f212f6a7bee134f6df2d1d21",
                 "sha256:1afbac344aa68c29e81ab56c1a9411c3663157b5aee5065b7fa030b398d4f7e0",
-                "sha256:1f179dc8b2643715f020f4d119d5529b02cd794c1c8f305868b73b8674d2a03f",
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-                "sha256:3aa3f5288af349a0f3a96448ebf2e57e17332d99f4f30b02093b7948bd9f94cc",
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                 "sha256:1baad9d073692421ad5dbbd81430aba6c7f5fdc347f03537ae046ddf2c9b2297",
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                 "sha256:1d8736421a2358becd3edf20260e41a06a0bf08a560480d3a5734a6bcbacf591",
-                "sha256:b4f67b5183bd5f9bafaeb76ad119e977ba570d2b0e61202f534ac9b5c33b4485",
                 "sha256:1e1d9bddc5afaddf0de76246d3f2152f961697ad7439c559f179002682c45801",
-                "sha256:51102e160b9d83c1cc435162d90b8e3c8c93b28d18d87b60c56522d332d26879",
-                "sha256:34dfaa8c02891f9a246b17a732ca3e99c5e42802416628e740a5d1cb2f50ff49",
+                "sha256:1f179dc8b2643715f020f4d119d5529b02cd794c1c8f305868b73b8674d2a03f",
+                "sha256:241fb7bdf97cb1df1edfa8f0bcdfd80525d4023dac4523a241907c8b2f44e541",
                 "sha256:2f9765ee5acd3dbdcdc0d0c79309e01f7c16bc8d39b49250bf88de7b46daaf58",
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                 "sha256:312e1e1b1c3ce0c67e0b8105317323e12807955e8186872affb667dbd67971f6",
-                "sha256:d1e111b3ab98613115a208c1017f266478b0ab224a67bc8eac670fa0bad7d488"
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+                "sha256:51102e160b9d83c1cc435162d90b8e3c8c93b28d18d87b60c56522d332d26879",
+                "sha256:56115fc2e2a4140e8994eb9585119a1ae9223b506826089a3ba753a62bd194a6",
+                "sha256:69d83de14dbe8fe51dccfd36f88bf0b40f5debeac763edf9f8325180190eba6e",
+                "sha256:99fdce94aeaa3ccbdfcb1e23b34273605c5853aa92ec23d84c84765178662c6c",
+                "sha256:a7c0cd5b8a20f3093ee4a67374ccb3b8a126743b15a4d759e2a1bf098faac2b2",
+                "sha256:abe12886554634ed95416a46701a917784cb2b4c77bfacac6916681d49bbf83d",
+                "sha256:b4f67b5183bd5f9bafaeb76ad119e977ba570d2b0e61202f534ac9b5c33b4485",
+                "sha256:bdd7c1658475cc1b867b36d5c4ed4bc316be8d3368abe03d348ba906a1f83b0e",
+                "sha256:c6f24149a19f611a415a51b9bc5f17b6c2f698e0d6b41ffb3fa9f24d35d05d73",
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+                "sha256:d6520aa965773bbab6cb7a791d5895b00d02cf9adc93ac2bf4edb9ac1a6addc5",
+                "sha256:dd185cde2ccad7b649593b0cda72021bc8a91667417001dbaf24cd746ecb7c11",
+                "sha256:de2e5b0828a9d285f909b5d2e9d43f1cf6cf21fe65bc7660bdaa1780c7b58298",
+                "sha256:f726444b8e909c4f41b4fde416e1071cf28fa84634bfb4befdf400933b6463af"
             ],
+            "index": "pypi",
             "version": "==4.3.0"
         }
     },
     "develop": {
         "atomicwrites": {
             "hashes": [
-                "sha256:03472c30eb2c5d1ba9227e4c2ca66ab8287fbfbbda3888aa93dc2e28fc6811b4",
-                "sha256:75a9445bac02d8d058d5e1fe689654ba5a6556a1dfd8ce6ec55a0ed79866cfa6"
+                "sha256:6d1784dea7c0c8d4a5172b6c620f40b6e4cbfdf96d783691f2e1302a7b88e197",
+                "sha256:ae70396ad1a434f9c7046fd2dd196fc04b12f9e91ffb859164193be8b6168a7a"
             ],
-            "version": "==1.3.0"
+            "version": "==1.4.0"
         },
         "attrs": {
             "hashes": [
-                "sha256:ca4be454458f9dec299268d472aaa5a11f67a4ff70093396e1ceae9c76cf4bbb",
-                "sha256:10cbf6e27dbce8c30807caf056c8eb50917e0eaafe86347671b57254006c3e69"
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+                "sha256:832aa3cde19744e49938b91fea06d69ecb9e649c93ba974535d08ad92164f700"
             ],
-            "version": "==18.2.0"
+            "version": "==20.3.0"
         },
         "more-itertools": {
             "hashes": [
-                "sha256:c0a5785b1109a6bd7fac76d6837fd1feca158e54e521ccd2ae8bfe393cc9d4fc",
-                "sha256:fe7a7cae1ccb57d33952113ff4fa1bc5f879963600ed74918f1236e212ee50b9",
-                "sha256:38a936c0a6d98a38bcc2d03fdaaedaba9f412879461dd2ceff8d37564d6522e4"
+                "sha256:5652a9ac72209ed7df8d9c15daf4e1aa0e3d2ccd3c87f8265a0673cd9cbc9ced",
+                "sha256:c5d6da9ca3ff65220c3bfd2a8db06d698f05d4d2b9be57e1deb2be5a45019713"
             ],
-            "version": "==5.0.0"
+            "version": "==8.7.0"
         },
         "pluggy": {
             "hashes": [
-                "sha256:980710797ff6a041e9a73a5787804f848996ecaa6f8a1b1e08224a5894f2074a",
-                "sha256:8ddc32f03971bfdf900a81961a48ccf2fb677cf7715108f85295c67405798616"
+                "sha256:15b2acde666561e1298d71b523007ed7364de07029219b604cf808bfa1c765b0",
+                "sha256:966c145cd83c96502c3c3868f50408687b38434af77734af1e9ca461a4081d2d"
             ],
-            "version": "==0.8.1"
+            "version": "==0.13.1"
         },
         "py": {
             "hashes": [
-                "sha256:e76826342cefe3c3d5f7e8ee4316b80d1dd8a300781612ddbc765c17ba25a6c6",
-                "sha256:bf92637198836372b520efcba9e020c330123be8ce527e535d185ed4b6f45694"
+                "sha256:21b81bda15b66ef5e1a777a21c4dcd9c20ad3efd0b3f817e7a809035269e1bd3",
+                "sha256:3b80836aa6d1feeaa108e046da6423ab8f6ceda6468545ae8d02d9d58d18818a"
             ],
-            "version": "==1.7.0"
+            "index": "pypi",
+            "version": "==1.10.0"
         },
         "pytest": {
             "hashes": [
-                "sha256:6ac6d467d9f053e95aaacd79f831dbecfe730f419c6c7022cb316b365cd9199d",
-                "sha256:65aeaa77ae87c7fc95de56285282546cfa9c886dc8e5dc78313db1c25e21bc07"
+                "sha256:65aeaa77ae87c7fc95de56285282546cfa9c886dc8e5dc78313db1c25e21bc07",
+                "sha256:6ac6d467d9f053e95aaacd79f831dbecfe730f419c6c7022cb316b365cd9199d"
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+            "index": "pypi",
             "version": "==4.2.0"
         },
         "six": {
             "hashes": [
-                "sha256:3350809f0555b11f552448330d0b52d5f24c91a322ea4a15ef22629740f3761c",
-                "sha256:d16a0141ec1a18405cd4ce8b4613101da75da0e9a7aec5bdd4fa804d0e0eba73"
+                "sha256:30639c035cdb23534cd4aa2dd52c3bf48f06e5f4a941509c8bafd8ce11080259",
+                "sha256:8b74bedcbbbaca38ff6d7491d76f2b06b3592611af620f8426e82dddb04a5ced"
             ],
-            "version": "==1.12.0"
+            "version": "==1.15.0"
         }
     }
 }