ChannelInvoker.newPromise should pass file and line to eventLoop.newP…

…romise (#202) (#208)

Motivation:

Introduced some new parameters to fix #202

Modifications:

Created new parameters for the file and line newPromise method inside ChannelOutboundInvoker.

Result:

File and line numbers are now passed to the eventLoop object, all unit tests have been passed.

Sources/NIO/ChannelInvoker.swift

@@ -179,8 +179,8 @@ extension ChannelOutboundInvoker {
         return promise.futureResult
     }
 
-    private func newPromise() -> EventLoopPromise<Void> {
-        return eventLoop.newPromise()
+    private func newPromise(file: StaticString = #file, line: UInt = #line) -> EventLoopPromise<Void> {
+        return eventLoop.newPromise(file: file, line: line)
     }
 }