fix: pass the handshake failure on

Failed handshakes abort the connection but dont inform users of the failure properly. If a remote was not successfully negotiated this could cause a peerId missing issue

src/handshake/index.js

@@ -24,7 +24,7 @@ module.exports = function handshake (state, callback) {
     }
 
     // signal when the handshake is finished so that plumbing can happen
-    callback()
+    callback(err)
   })
 
   return state.stream