List all textures.

README.md

@@ -9,8 +9,11 @@ it under the terms of the GNU Lesser General Public License as
 published by the Free Software Foundation; either version 2.1
 of the license, or (at your option) any later version.
 
+
 Textures: CC-BY-SA-4.0 by sofar
     lightning_1.png
+    lightning_2.png
+    lightning_3.png
 
 Sounds:
     thunder.1.ogg - CC-BY-SA - hantorio - http://www.freesound.org/people/hantorio/sounds/121945/