Fix requirementslib bug

Signed-off-by: Dan Ryan <[email protected]>

pipenv/vendor/requirementslib/models/requirements.py

@@ -649,7 +649,8 @@ def locked_vcs_repo(self, src_dir=None):
         # Remove potential ref in the end of uri after ref is parsed
         if "@" in self.link.show_url and "@" in self.uri:
             uri, ref = self.uri.rsplit("@", 1)
-            if self.ref and ref in self.ref:
+            checkout = self.req.revision
+            if checkout and ref in checkout:
                 self.uri = uri
 
         yield vcsrepo