Fix `IllegalReferenceCountException` in `ResponseDecoder` (#795)
Fix `IllegalReferenceCountException` in `ResponseDecoder` (#795)

Releasing the `ByteBuf` given as an argument to a `MessageToMessageDecoder`
ornicar/ReactiveMongo,cchantep/ReactiveMongo,ReactiveMongo/ReactiveMongo,ReactiveMongo/ReactiveMongo,ornicar/ReactiveMongo,cchantep/ReactiveMongo