Firebase pricing update

Firebase has updated their free tier pricing, doubling the max
concurrent users, database bandwidth and database storage.

https://www.firebase.com/blog/2015-08-19-announcing-lower-simpler-pricing.html

README.md

@@ -257,7 +257,7 @@ Table of Contents
   * https://appharbor.com/ - A .Net PaaS that provides 1 free worker
   * https://shellycloud.com/ - Platform for hosting Ruby and Ruby on Rails apps. Shelly Cloud gives €20 free credit
   * https://www.heroku.com/ - Host your apps in the cloud, free for single process apps
-  * https://www.firebase.com/ - Build realtime apps, free plan has 50 Max Connections, 5 GB Data Transfer, 100 MB Data Storage. 1 GB Hosting Storage and 100 GB Hosting Transfer.
+  * https://www.firebase.com/ - Build realtime apps, free plan has 100 Max Connections, 10 GB Data Transfer, 1 GB Data Storage. 1 GB Hosting Storage and 100 GB Hosting Transfer.
   * https://bluemix.net/ - IBM PaaS with a monthly free allowance
   * https://www.openshift.com/ - Red Hat PaaS, free tier provides three small gears (each with 512MB memory, 1GB storage). {[Browse one-click deployments](https://hub.openshift.com/)}.
   * https://algorithmia.com/ - Host algorithms for free - includes 10,000 credits (seconds of on-demand execution time) free