simplofy the promise chain

src/job.js

@@ -49,8 +49,7 @@ export default class Job extends events.EventEmitter {
     if (options.headers) indexParams.headers = options.headers;
 
     this.ready = createIndex(this.client, this.index, this.doctype)
-    .then(() => {
-      return this.client.index(indexParams)
+    .then(() => this.client.index(indexParams))
     .then((doc) => {
       this.document = {
         id: doc._id,
@@ -59,7 +58,6 @@ export default class Job extends events.EventEmitter {
       };
       this.debug(`Job created in index ${this.index}`);
       this.emit('created', this.document);
-      });
     })
     .catch((err) => {
       this.debug('Job creation failed', err);