turned publish controller into promise

controllers/publishController.js

@@ -26,6 +26,7 @@ function upsert (Model, values, condition) {
 
 module.exports = {
   publish: (publishParams, fileName, fileType) => {
+    const deferred = new Promise((resolve, reject) => {
       // 1. publish the file
       lbryApi
         .publishClaim(publishParams)
@@ -54,5 +55,7 @@ module.exports = {
           // delete the local file
           deleteTemporaryFile(publishParams.file_path);
         });
+    });
+    return deferred;
   },
 };