README.md: Add installation note for those wishing to stay with latest stable version

Signed-off-by: Lilis Iskandar <[email protected]>

Author: veeableful

README.md

@@ -62,6 +62,8 @@ To get the bindings, type:
 or type this if you use Bash terminal:  
 `go get -v github.com/veandco/go-sdl2/{sdl,mix,img,ttf}`
 
+Due to `go-sdl2` being under active development, a lot of breaking changes are going to happen during v0.x. Therefore if you want to stay with the latest stable version, you should replace `github.com/veandco/go-sdl2` with `gopkg.in/veandco/go-sdl2.v0` so it will refer to the latest stable version e.g. `gopkg.in/veandco/go-sdl2.v0/sdl`.
+
 __Note__: If you didn't use the previous commands or use 'go install', you will experience long
 compilation time because Go doesn't keep the built binaries unless you install them.