docs(readme): update mongodb link

[skip ci]

Author: Awk34

Diff for: readme.md

@@ -33,7 +33,7 @@ Run `grunt` for building, `grunt serve` for preview, and `grunt serve:dist` for
 
 ## Prerequisites
 
-* MongoDB - Download and Install [MongoDB](http://www.mongodb.org/downloads) - If you plan on scaffolding your project with mongoose, you'll need mongoDB to be installed and have the `mongod` process running.
+* MongoDB - Download and Install [MongoDB](https://www.mongodb.com/download-center#community) - If you plan on scaffolding your project with mongoose, you'll need mongoDB to be installed and have the `mongod` process running.
 
 ## Supported Configurations