Prepare release 1.7.1

Author: rhpvorderman

CHANGELOG.rst

@@ -7,7 +7,7 @@ Changelog
 .. This document is user facing. Please word the changes in such a way
 .. that users understand how the changes affect the new version.
 
-version 1.7.1-dev
+version 1.7.1
 -----------------
 + Fix a bug where flushing files when writing in threaded mode did not work
   properly.