update license.txt

license.txt

@@ -20,7 +20,16 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 
-mobs.fireball.png was originally made by Sapier and edited by Benrob:
+-- Animals Mod by Sapier
+--
+-- You may copy, use, modify or do nearly anything except removing this
+-- copyright notice.
+-- And of course you are NOT allow to pretend you have written it.
+--
+-- (c) Sapier
+-- Contact sapier a t gmx net
+
+mobs.fireball.png was originally made by Sapier (WTFPL) and edited by Benrob:
 
 -- Animals Mod by Sapier
 --