Update README;

bjornbytes · bjornbytes · commit cfdcb34f31ca · 2017-01-06T19:25:06.000-08:00
diff --git a/README.md b/README.md
@@ -29,7 +29,7 @@ should see a spinning purple cube!
 
 Play an ogg file:
 
-```
+```lua
 function lovr.load()
   local sound = lovr.audio.newSource('darudeSandstorm.ogg')
   sound:play()
