Make readme clearer that 1.6.3 has not been released.
libtcod is a free, fast, portable and uncomplicated API for roguelike developers providing an advanced true color console, input, and lots of other utilities frequently used in roguelikes.
-1.6.3: [![Build status](https://ci.appveyor.com/api/projects/status/6jh07hq205iy0mlh/branch/default?svg=true)](https://ci.appveyor.com/project/rmtew/libtcod/branch/default)
+1.6.3 (pre-release): [![Build status](https://ci.appveyor.com/api/projects/status/6jh07hq205iy0mlh/branch/default?svg=true)](https://ci.appveyor.com/project/rmtew/libtcod/branch/default)
## What can it do? ##
