Bump version to 0.4.1

Bump version to 0.4.0.

Version bump to 0.3.13.

chore: version bump to 0.3.12

Version bump to 0.3.11.

Updated changelog.

Merge pull request codestation#24 from a-detiste/master

debian: fix most lintian warnings, switch to debhelper 9

Update changelog.

bump version.

Put the real changelog into the debian directory to comply with lintian.

Fix stupid bug with function scope.