release: 0.1.0

Merged a few more PRs from upstream, at least one has a breaking change.

The function 'OAuth2Fetcher' has been renamed to 'OAuth1Fetcher', the
function signature remains the same.

discogs_api/__init__.py

@@ -1,6 +1,6 @@
 from __future__ import absolute_import, division, print_function, unicode_literals
 
-__version__ = '0.0.3'
+__version__ = '0.1.0'
 
 from discogs_api.client import Client
 from discogs_api.models import Artist, Release, Master, Label, User, \