fix(test_docs): skip master-dependent assertion

It usually fails on branches, which doesn't help
assessing PRs.

Author: Byron

git/test/test_docs.py

@@ -64,7 +64,9 @@ def test_init_repo_object(self, rw_dir):
         assert repo.head.ref == repo.heads.master                   # head is a symbolic reference pointing to master
         assert repo.tags['0.3.5'] == repo.tag('refs/tags/0.3.5')    # you can access tags in various ways too
         assert repo.refs.master == repo.heads['master']             # .refs provides access to all refs, i.e. heads ...
-        assert repo.refs['origin/master'] == repo.remotes.origin.refs.master  # ... remotes ...
+        
+        if 'TRAVIS' not in os.environ:
+            assert repo.refs['origin/master'] == repo.remotes.origin.refs.master  # ... remotes ...
         assert repo.refs['0.3.5'] == repo.tags['0.3.5']             # ... and tags
         # ![8-test_init_repo_object]