Setting version to 2.3.0-RC3
Setting version to 2.3.0-RC3

lukasz-golebiewski/shapeless,alexarchambault/shapeless,triggerNZ/shapeless,lambdista/shapeless,liff/shapeless,milessabin/shapeless,khronnuz/shapeless,wheaties/shapeless,fthomas/shapeless,isaka/shapeless