reverted changes to readme.md

Author: Stephen Hodgson

README.md

@@ -4,7 +4,7 @@ The HoloToolkit is a collection of scripts and components intended to accelerate
 
 **Current Unity Editor Project Version: 5.5.0f3**
 
-**HoloToolkit contains the following feature areas:**
+HoloToolkit contains the following feature areas:
 
 1. [Input](Assets/HoloToolkit/Input/README.md)
 2. [Sharing](Assets/HoloToolkit/Sharing/README.md)