Bump version to 2.0.26

CHANGES.rst

@@ -6,7 +6,7 @@ This is a record of changes made between each Mutalyzer release.
 Version 2.0.26
 ---------------
 
-Release date to be decided.
+Released on July 19th 2017.
 
 - Description-extractor dependency updated to version 2.35 (`#
   <https://github.com/mutalyzer/mutalyzer/pull/429>`_).

mutalyzer/__init__.py

@@ -21,8 +21,8 @@ from __future__ import unicode_literals
 # [1] http://peak.telecommunity.com/DevCenter/setuptools#specifying-your-project-s-version
 # [2] http://semver.org/
 
-__version_info__ = ('2', '0', '26', 'dev')
-__date__ = '17 May 2017'
+__version_info__ = ('2', '0', '26')
+__date__ = '19 July 2017'
 
 
 __version__ = '.'.join(__version_info__)