Update README (again)

README.md

@@ -40,16 +40,21 @@ than from `package` loaders.
 
 To build raylib-lua from source, you need to take care that submodules are
 imported, if not or you are unsure :
+
 ```shell
 git submodule init
 git submodule update
 ```
+
+A Lua working interpreter is needed, by default luajit is used, to override it,
+edit LUA variable in `makefile`.
+
 This make take some time depending on network bandwidth.
 Then, raylib-lua should build as expected using `make` tool with a working C compiler.
 
 If you need to update raylib binding, there are few tasks to do :
- - update tools/api.h functions signatures, keep file clean with exactly one function per line.
- - update struct definitions in src/raylib.lua
+ - update `tools/api.h` functions signatures, keep file clean with exactly one function per line.
+ - update struct definitions in `src/raylib.lua`
 
 ### Licence