refactor: add string encoding

Author: pthompson127

optimizely/project_config.py

@@ -40,7 +40,7 @@ def __init__(self, datafile, logger, error_handler):
         """
 
         config = json.loads(datafile)
-        self._datafile = str(datafile)
+        self._datafile = datafile.encode('utf-8')
         self.logger = logger
         self.error_handler = error_handler
         self.version = config.get('version')