fix headings

README.md

@@ -1,4 +1,4 @@
-#pituicat
+# pituicat
 
 This repository contains the source and game design files for the game
 `pituicat`.
@@ -6,18 +6,18 @@ This repository contains the source and game design files for the game
 This game is still an experimental work in progress, so things are subject to
 change and no version or revision numbers are being assigned (yet).
 
-##Build and run instructions
+## Build and run instructions
 
 For any system you want to buil on, you will need a current version of `ghc`
 as well as the build tool `cabal`. Additional libraries may be needed,
 depending on your operating system.
 
-###Linux
+### Linux
 
 I develop this game in [NixOS](https://nixos.org), so the build instructions
 for this system are the ones I use on a daily basis.
 
-####NixOS
+#### NixOS
 
 To set up the build environment, simply run this in the command line of your
 choice:
@@ -35,20 +35,20 @@ cabal new-run
 
 to compile and run the game.
 
-####Other Linux flavours
+#### Other Linux flavours
 
 You will need at least the development libraries for `sdl2` and a development
 setup for `OpenGL`.
 
 TODO: provide list of development libraries this game directly depends on.
 
-###Other operating systems
+### Other operating systems
 
 I wish you good luck with that. If you manage to run the game on other systms,
 ping me with build and run instructions on <nek0@nek0.eu> and I will gladly
 include them here.
 
-##Gameplay
+## Gameplay
 
 Since there is no interactive content yet, there is nothing much to write here
 other than: enjoy the visuals!