Fix for UnicodeEncodeError in git.Repo.clone_from() when path contains non-ascii characters

Author: xarx00

Diff for: gitdb/utils/encoding.py

@@ -8,7 +8,7 @@
     text_type = unicode
 
 
-def force_bytes(data, encoding="ascii"):
+def force_bytes(data, encoding="utf-8"):
     if isinstance(data, bytes):
         return data