Update README to include Cortex V4

Author: thamha-emotiv

README.md

@@ -1,10 +1,10 @@
 # Overview
-Example code for Cortex V2 & V3. So far we have the following languages:
+Example code for Cortex V2 & V3 & V4. So far we have the following languages:
 * C++ (with Qt library https://www.qt.io)
 * C#
 * NodeJS
 * Python
 * Unity
 
 # API Documentation
-For Cortex V2 / V3 API documentations please check out: https://emotiv.gitbook.io/cortex-api/
+For Cortex V2 / V3 / V4 API documentations please check out: https://emotiv.gitbook.io/cortex-api/