Update README.md

Author: pieroxy

README.md

@@ -1,4 +1,10 @@
 # lz-string-go
 Port of the decompression algorithm in Go.
 
-Please help yourself and copy-paste away. This is not a lib to be maintained, this is a piece of code that you should use as an example.
+## Usage
+Please help yourself and copy-paste away. This is not a lib to be maintained, this is a piece of code that you should use as an example. 
+
+All releases of [lz-string](https://github.com/pieroxy/lz-string) have always been binary compatibles and will be in the future, so there is no worries about compatibility with future versions of lz-string.
+
+## License
+This code is licensed under the [WTFPL](http://www.wtfpl.net/)