Merge pull request #210 from taylorstine/regexr_comment

updated regexr link for updated regex

ExportAdapter.js

@@ -34,7 +34,7 @@ ExportAdapter.prototype.connect = function() {
     return this.connectionPromise;
   }
 
-  //http://regexr.com/3cn6m
+  //http://regexr.com/3cncm
   if (!this.mongoURI.match(/^mongodb:\/\/((.+):(.+)@)?([^:@]+):{0,1}([^:]+)\/(.+?)$/gm)) {
     throw new Error("Invalid mongoURI: " + this.mongoURI)
   }