docs: Update status badges

readme.rst

@@ -8,7 +8,7 @@ for js by Stephan Bönnemann. If you find this topic interesting you
 should check out his `talk from JSConf
 Budapest <https://www.youtube.com/watch?v=tc2UgG5L7WM>`__.
 
-|Build status| |Coverage status| |PyPI version| |Trello|
+|Build status| |PyPI version| |Trello|
 
 Install
 -------
@@ -83,10 +83,8 @@ pull-request to `roadmap.md`_.
 .. _trello board: https://trello.com/b/ylmdOYr1/python-semantic-release
 .. _roadmap.md: https://github.com/relekang/python-semantic-release/blob/master/roadmap.md
 
-.. |Build status| image:: https://ci.frigg.io/relekang/python-semantic-release.svg?branch=master
-   :target: https://ci.frigg.io/relekang/python-semantic-release
-.. |Coverage status| image:: https://ci.frigg.io/relekang/python-semantic-release/coverage.svg?branch=master
-   :target: https://ci.frigg.io/relekang/python-semantic-release
+.. |Build status| image:: https://circleci.com/gh/relekang/python-semantic-release.svg?style=svg
+    :target: https://circleci.com/gh/relekang/python-semantic-release
 .. |PyPI version| image:: https://badge.fury.io/py/python-semantic-release.svg
 .. |Trello| image:: https://img.shields.io/badge/trello-board-blue.svg
    :target: https://trello.com/b/ylmdOYr1/python-semantic-release