chore(heroku): support heroku mongodb url (snyk-labs#720)

Author: lirantal

app.json

@@ -1,7 +1,18 @@
 {
   "name": "goof",
-  "scripts": {
-  },
+  "description": "A Snyk vulnerable Goof app on Heroku",
+  "repository": "https://github.com/snyk/goof",
+  "logo": "https://snyk.io/wp-content/uploads/title-card-avatar.png",
+  "keywords": [
+    "snyk",
+    "goof",
+    "heroku",
+    "node",
+    "security",
+    "vulnerabilities"
+  ],
+  "image": "heroku/nodejs",
+  "scripts": {},
   "env": {
     "MONGOLAB_URI": {
       "required": true
@@ -20,4 +31,4 @@
       "url": "heroku/nodejs"
     }
   ]
-}
+}

db.js

@@ -35,7 +35,11 @@ if (mongoCFUri) {
 } else if (process.env.MONGOLAB_URI) {
   // Generic (plus Heroku) env var support
   mongoUri = process.env.MONGOLAB_URI;
+} else if (process.env.MONGODB_URI) {
+  // Generic (plus Heroku) env var support
+  mongoUri = process.env.MONGODB_URI;
 }
+
 console.log("Using Mongo URI " + mongoUri);
 
 mongoose.connect(mongoUri);