remove Py2.6 and add Coverage Report Badge

README.rst

@@ -12,6 +12,10 @@ Overview
     :target: https://gitlab.com/rhab/PyOTRS/commits/master
     :alt: Build Status
 
+.. |CoverageReport| image:: https://gitlab.com/rhab/PyOTRS/badges/master/coverage.svg
+    :target: https://gitlab.com/rhab/PyOTRS/commits/master
+    :alt: Coverage Report
+
 .. |DocsBuildStatus| image:: https://readthedocs.org/projects/pyotrs/badge/?version=latest
     :target: https://pyotrs.readthedocs.org/en/latest/index.html
     :alt: Docs Build Status
@@ -21,7 +25,7 @@ Overview
     :alt: MIT licensed
 
 .. |PythonVersions| image:: https://img.shields.io/badge/python-2.6%2C%202.7%2C%203.3%2C%203.4%2C%203.5-blue.svg
-    :alt: python: 2.6, 2.7, 3.3, 3.4, 3.5
+    :alt: python: 2.7, 3.3, 3.4, 3.5