Update dependency core-js to v3.4.2

package.json

@@ -19,7 +19,7 @@
     "@angular/platform-browser": "8.2.9",
     "@angular/platform-browser-dynamic": "8.2.9",
     "@angular/router": "8.2.9",
-    "core-js": "3.2.1",
+    "core-js": "3.4.2",
     "rxjs": "6.3.3",
     "tslib": "1.9.3",
     "zone.js": "0.10.2"

yarn.lock

@@ -2511,6 +2511,11 @@ [email protected]:
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-3.2.1.tgz#cd41f38534da6cc59f7db050fe67307de9868b09"
   integrity sha512-Qa5XSVefSVPRxy2XfUC13WbvqkxhkwB3ve+pgCQveNgYzbM/UxZeu1dcOX/xr4UmfUd+muuvsaxilQzCyUurMw==
 
+[email protected]:
+  version "3.4.2"
+  resolved "https://registry.yarnpkg.com/core-js/-/core-js-3.4.2.tgz#ee2b1a60b50388d8ddcda8cdb44a92c7a9ea76df"
+  integrity sha512-bUTfqFWtNKWp73oNIfRkqwYZJeNT3lstzZcAkhhiuvDraRSgOH1/+F9ZklbpR4zpdKuo4cpXN8tKP7s61yjX+g==
+
 core-js@^2.4.0:
   version "2.6.5"
   resolved "https://registry.yarnpkg.com/core-js/-/core-js-2.6.5.tgz#44bc8d249e7fb2ff5d00e0341a7ffb94fbf67895"