add mongoose promise (was lost during merge)

src/libs/db/mongoose.js

@@ -6,6 +6,8 @@ const log = require(`${libs}/log`)(module);
 
 const mongoose = require('mongoose');
 
+mongoose.Promise = global.Promise;
+
 module.exports = () => {
     const mongoUri = process.env.MONGO_URI || config.get('mongodb:uri');
     log.debug(`Connecting to MongDB on URI ${mongoUri}`);