committer_date to string

circleci API calls are currently not including this? Just let it slide, this doesn't seem to serve any purpose other than to tell you more about what version of the code you're using

Author: alexcjohnson

packages/python/plotly/setup.py

@@ -420,7 +420,7 @@ def run(self):
 
         # update plotly.js version in _plotlyjs_version
         rev = build_info["vcs_revision"]
-        date = build_info["committer_date"]
+        date = str(build_info["committer_date"])
         version = "_".join([self.devrepo, self.devbranch, date[:10], rev[:8]])
         overwrite_plotlyjs_version_file(version)