Fix MONGODB_URI reference in error message

Author: sulkaharo

lib/storage/mongo-storage.js

@@ -52,15 +52,15 @@ function init (env, cb, forceNewConnection) {
             .catch(err => {
               if (err.message && err.message.includes('AuthenticationFailed')) {
                 console.log('Authentication to Mongo failed');
-                cb(new Error('MongoDB authentication failed! Double check the URL has the right username and password in MONGO_CONNECTION.'), null);
+                cb(new Error('MongoDB authentication failed! Double check the URL has the right username and password in MONGODB_URI.'), null);
                 return;
               }
 
               if (err.name && err.name === "MongoNetworkError") {
                 var timeout = (i > 15) ? 60000 : i * 3000;
                 console.log('Error connecting to MongoDB: %j - retrying in ' + timeout / 1000 + ' sec', err);
                 setTimeout(connect_with_retry, timeout, i + 1);
-                if (i == 1) cb(new Error('MongoDB authentication failed! Double check the MONGO_CONNECTION setting in Heroku.'), null);
+                if (i == 1) cb(new Error('MongoDB connection failed! Double check the MONGODB_URI setting in Heroku.'), null);
               } else {
                 cb(new Error('MONGODB_URI ' + env.storageURI + ' seems invalid: ' + err.message));
               }