fix Python 2 error: 'file' object has no attribute 'readable' (issue #115)

Author: JohannesBuchner

kaggle/api/kaggle_api_extended.py

@@ -2353,7 +2353,7 @@ def upload_complete(self, path, url, quiet):
                     unit_scale=True,
                     unit_divisor=1024,
                     disable=quiet) as progress_bar:
-                with open(path, 'rb', buffering=0) as fp:
+                with io.open(path, 'rb', buffering=0) as fp:
                     reader = TqdmBufferedReader(fp, progress_bar)
                     session = requests.Session()
                     retries = Retry(total=10, backoff_factor=0.5)