allow more rolls at once, 30 seems ok

Signed-off-by: Brian S. Stephan <bss@incorporeal.org>

dice/roller.py

@@ -65,7 +65,7 @@ class DiceRoller(object):
         """
         rolls = mods[0][0][1] if mods[0][0][1] else 1
         if trials:
-            assert trials <= 10, "Too many rolls (max: 10)."
+            assert trials <= 30, "Too many rolls (max: 30)."
         assert rolls <= 50, "Too many dice (max: 50) in roll."
 
         output = ""