Merge pull request #21 from dgraph-io/santo/supported-versions

Add new section 'Supported Versions'

Author: Paul Korzhyk

README.md

@@ -17,6 +17,7 @@ and understand how to run and work with Dgraph.
 ## Table of contents
 
   - [Install](#install)
+  - [Supported Versions](#supported-versions)
   - [Quickstart](#quickstart)
   - [Using a client](#using-a-client)
     - [Create a client](#create-a-client)
@@ -51,6 +52,15 @@ You will also need a Promise polyfill for
 We recommend [taylorhakes/promise-polyfill](https://github.com/taylorhakes/promise-polyfill)
 for its small size and Promises/A+ compatibility.
 
+## Supported Versions
+
+Depending on the version of Dgraph that you are connecting to, you will have to
+use a different version of this client.
+
+| Dgraph version | dgraph-js-http version |
+|:--------------------:|:------------------------------:|
+|        >= 1.1       |            >= *1.1.1*           |
+
 ## Quickstart
 
 Build and run the [simple] project in the `examples` folder, which