bley 2.0.0-beta.1 released

After only three years, I have finally released bley 2.0.0-beta.1, the first milestone to bley 2.0.0. Yes, this is a huge version jump, mostly because the 0.1.x series was more like a 1.0 series and semantic versioning suggests do increase the major digit when doing incompatible changes (updated DB layout, new command line switches, etc). Please test this and report if you find any issues.