Release 0.12.1

This is a patch release, allowing the user to specify the output format of the tbt_converter in the case without noise (was always lhc, which is still the default, if not given).

• Fixed:
  • tbt_converter now also passes given output format to writer when running without noise.

What's Changed

• Fix tbt converter output flag by @JoschD in #433

Full Changelog: 0.12.0...0.12.1