fix(TcpSource): subscribe to correct event

We're subscribing to the socket.finish event, but no such event exists
according to the official NodeJS documentation. There is one called
socket.end though, lets use that one.

Closes #403

Author: mattias-kindborg-at-work

lib/components/tcp/index.ts

@@ -62,8 +62,8 @@ export class TcpSource extends Source {
           })
           // When closing a socket, indicate there is no more data to be sent,
           // but leave the outgoing stream open to check if more requests are coming.
-          socket.on('finish', (e) => {
-            console.warn('socket finished', e)
+          socket.on('end', () => {
+            console.warn('socket ended')
             incoming.push(null)
           })
         }