update tmx lib dep

requirements.txt

 PyYAML==3.12
 redis==2.10.6
 six==1.11.0
-tmx==1.9.1
+tmx==1.9.1.1
 git+https://github.com/buxx/synergine2.git@master
 git+https://github.com/buxx/cocos.git@tileset