Upgrade version code to v1.1.2

* Modify readme and document to reflect change made to v1.1.2

Author: clku

Developer's Guide.pdf

@@ -1,5 +1,5 @@
 # Vive Stereo Rendering Toolkit
-Copyright 2016-2017, HTC Corporation. All rights reserved.
+Copyright 2016-2018, HTC Corporation. All rights reserved.
 
 ## Introduction
 
@@ -24,6 +24,9 @@ For tutorial and API reference, please see the attached Developer's Guide.
 
 ## Change log
 
+v1.1.2
+ - Add option to make StereoRenderers unlit by scene lights (default off)
+
 v1.1.1
  - Add option to enable oblique near plane clipping for better performance (default on)
  - Add option to enable scissor test for better performance (default on)