remove warning suppression that no longer applies

Author: bpholt

finagle-natchez/src/main/scala/com/dwolla/util/async/finagle/TracedThriftClient.scala

@@ -38,7 +38,6 @@ object TracedThriftClient {
    */
   def apply[Alg[_[_]] <: AnyRef {def asClosable: Closable}] = new PartiallyAppliedThriftClient[Alg]()
 
-  @annotation.nowarn("msg=dubious usage of method hashCode with unit value")
   class PartiallyAppliedThriftClient[Alg[_[_]] <: AnyRef {def asClosable: Closable}] private[TracedThriftClient](val dummy: Unit = ()) extends AnyVal {
     /**
      * @param name the local service name to be set on the Zipkin tracer

twitter-finagle/src/main/scala/com/dwolla/util/async/finagle/ThriftClient.scala

@@ -11,7 +11,6 @@ import com.twitter.util.{Closable, Future}
 object ThriftClient {
   def apply[Alg[_[_]] <: AnyRef {def asClosable: Closable}] = new PartiallyAppliedThriftClient[Alg]()
 
-  @annotation.nowarn("msg=dubious usage of method hashCode with unit value")
   class PartiallyAppliedThriftClient[Alg[_[_]] <: AnyRef {def asClosable: Closable}] private[ThriftClient] (val dummy: Unit = ()) extends AnyVal {
     def apply[G[_] : Async](dest: String)
                            (implicit