Set default throttleVal to 0.5.

diff --git a/StarTip.lua b/StarTip.lua
index 3af02f8..7bf841c 100644
--- a/StarTip.lua
+++ b/StarTip.lua
@@ -173,7 +173,7 @@ local defaults = {
 		unitFrameShow = 1,
 		otherFrameShow = 1,
 		errorLevel = 1,
-		throttleVal = 0
+		throttleVal = 0.5
 	}
 }