Move to versioning format we agreed on

Summary: - Move to 2 digit version date based

Reviewed By: terrelln

Differential Revision: D8826421

fbshipit-source-id: 200b813179a113500106064436541b1682948bf5

setup.py

@@ -15,7 +15,7 @@ def get_long_description():
 
 setup(
     name="xar",
-    version="18.7.11",
+    version="18.07.12",
     description="The XAR packaging toolchain.",
     long_description=get_long_description(),
     long_description_content_type="text/markdown",