Merge branch 'release' into 3.1.0-release

Signed-off-by: Joffrey F <joffrey@docker.com>

Conflicts:
	docker/version.py
	tests/unit/api_test.py
	tests/unit/utils_test.py

docs/change-log.md

 Change log
 ==========
 
+3.0.1
+-----
+
+[List of PRs / issues for this release](https://github.com/docker/docker-py/milestone/43?closed=1)
+
+### Bugfixes
+
+* Fixed a bug where `APIClient.login` didn't populate the `_auth_configs`
+  dictionary properly, causing subsequent `pull` and `push` operations to fail
+* Fixed a bug where some build context files were incorrectly recognized as
+  being inaccessible.
+* Fixed a bug where files with a negative mtime value would
+  cause errors when included in a build context
+
 3.0.0
 -----
 

tests/unit/api_test.py

@@ -221,7 +221,6 @@ class DockerApiTest(BaseAPIClientTest):
             'username': 'sakuya', 'password': 'izayoi'
         }
         assert args[1]['headers'] == {'Content-Type': 'application/json'}
-
         assert self.client._auth_configs['auths'] == {
             'docker.io': {
                 'email': None,