Allow reponame length configuration

[hans-d]

trafficstars

Is your feature request related to a problem? Please describe. Repo names are now shortened to a fixed number of chars. Would like some control for this.

Describe the solution you'd like config.yaml option to specify max chars

Additional context sometimes repo names are not very short

[chrheg]

This would be a really great feature to have.

[dlvhdr]

Done in #178