Fix promise-to-callback hook preventing other hook import.

Author: rybaczewa

lib/services/promise-to-callback.js

@@ -1,12 +1,12 @@
 
 /* globals setImmediate:1 */
 
-const asap = process && typeof process.nextTick === 'function'
-  ? process.nextTick : setImmediate;
-
 module.exports = function (promise) {
   console.log('**Deprecated** The promiseToCallback hook will be removed next FeathersJS version.');
 
+  const asap = process && typeof process.nextTick === 'function'
+    ? process.nextTick : setImmediate;
+
   return cb => {
     promise.then(
       data => {