Update platformio.ini

Author: hollyhockberry

examples/PlatformIO_SDL/platformio.ini

@@ -13,9 +13,7 @@ default_envs = native
 
 [env]
 lib_extra_dirs=../../../
-lib_deps =
-  https://github.com/m5stack/M5GFX#develop  ; Until 0.1.12 or later..
-  m5stack/M5Unified@^0.1.11
+lib_deps = m5stack/M5Unified@^0.1.11
 
 [env:native]
 platform = native