Increase upper limit on light transitions (#2843)

This increases the global limit to 6535 seconds (1h48m55s) because that is
supported by all light platforms.

Some platforms support even longer transition times so the limit should
actually be platform specific.

homeassistant/components/light/hue.py

@@ -436,12 +436,7 @@ class HueLight(Light):
         command = {'on': False}
 
         if ATTR_TRANSITION in kwargs:
-            # Transition time is in 1/10th seconds and cannot exceed
-            # 900 seconds.
-            command['transitiontime'] = min(
-                9000,
-                int(kwargs[ATTR_TRANSITION] * 10)
-            )
+            command['transitiontime'] = int(kwargs[ATTR_TRANSITION] * 10)
 
         flash = kwargs.get(ATTR_FLASH)