Auto merge of #180 - olleolleolle:update-thor-020, r=bronzdoc
Auto merge of #180 - olleolleolle:update-thor-020, r=bronzdoc

gemspec: use Thor 0.20.0

#172 got confused.

This is the same change: use latest available Thor.

bundler/gemstash,bundler/gemstash,bundler/gemstash,crashlytics/gemstash,crashlytics/gemstash,crashlytics/gemstash