[REF] Filter out "bump version" from CHANGELOG

Commits which bump versions will no longer be displayed on the auto
generated CHANGELOG.

Closes #471.

setup.py

@@ -17,7 +17,7 @@ def generate_changelog():
             fchg.write(changelog_str)
         return changelog_str
     changelog = git._iter_log_oneline()
-    changelog = git._iter_changelog(changelog)
+    changelog = git._iter_changelog(filter(lambda log: not log[2].startswith("Bump version"), changelog))
     git.write_git_changelog(changelog=changelog)
     # git.generate_authors()
     return read(fname)