Update copyright years in README
Update copyright years in README

* First commit was in 2012 https://github.com/thoughtbot/hound/commit/802adac71b9a18be3a8fe55f844dc35574aeee7b
* Memories...

thoughtbot/hound,thoughtbot/hound,platanus/hound,platanus/hound,brgaulin/hound,q-centrix/hound,thoughtbot/hound,brgaulin/hound,q-centrix/hound,q-centrix/hound,houndci/hound,thoughtbot/hound,platanus/hound,houndci/hound,q-centrix/hound,houndci/hound,platanus/hound,houndci/hound,brgaulin/hound,brgaulin/hound