Added missing shapeless-contrib link; updated contributors.
Added missing shapeless-contrib link; updated contributors.

malcolmgreaves/shapeless,khronnuz/shapeless,clhodapp/shapeless,milessabin/shapeless,TomasMikula/shapeless,lambdista/shapeless,joescii/shapeless,tek/shapeless,alexarchambault/shapeless,Atry/shapeless,roberth/shapeless,lukasz-golebiewski/shapeless,wheaties/shapeless,fthomas/shapeless,liff/shapeless,notxcain/shapeless,triggerNZ/shapeless,isaka/shapeless