Added more details to README to address dependency issues (#132)

* Added more details to README to address dependency issues

* Add node version

README.md

@@ -15,7 +15,10 @@ Tandem Session. Invite other people to your session, and get typing in tandem!
 ### Requirements
 Tandem is currently supported on Mac OS X - it may work on Linux, but use at
 your own risk.  
-To use Tandem, your environment must have `python3` and `node.js` installed.
+To use Tandem, your environment must have `python3.6+` and `node.js` installed
+(tested and confirmed working on `node.js v7.7.4`).  
+`python3.6+` is a requirement for our agent code and `node.js` is required by
+our CRDT.
 
 ### Plugins
 Please follow the installation guides for your plugin of choice:
@@ -44,6 +47,11 @@ The CRDT is used to represent the state of your local document, and transforms
 document edits into operations that can be applied remotely, without conflicts.
 We submit these conflict-free operations to other peers via the agent.
 
+*Instead of reinventing the wheel and writing the CRDT ourselves, we leveraged
+the work done by GitHub's team working on Teletype. We used [their
+CRDT](https://github.com/atom/teletype-crdt) under the hood and instead
+focussed our efforts on integrating the CRDT with different editors.*
+
 ### Rendezvous Server
 The rendezvous server is used to help establish peer-to-peer connections. It
 server notes the connection details of any peer that joins a session. When any