Merge pull request #2767 from rtfd/fix-unicode-handling

Force unicode on verison string

Author: ericholscher

readthedocs/projects/version_handling.py

@@ -108,7 +108,9 @@ def version_windows(versions, major=1, minor=1, point=1):
 
 def parse_version_failsafe(version_string):
     try:
-        return Version(unicodedata.normalize('NFKD', version_string).encode('ascii', 'ignore'))
+        return Version(
+            unicodedata.normalize('NFKD', unicode(version_string)).encode('ascii', 'ignore')
+        )
     except (UnicodeError, InvalidVersion):
         return None