API GetExpansionForLevel

Needs summary.
 expansionLevel = GetExpansionForLevel(playerLevel)
==Arguments==
:;playerLevel:
==Returns==
:;expansionLevel:
==Values==
Levels	Expansion
1-30 	0 (LE_EXPANSION_CLASSIC)
31-35 	3 (LE_EXPANSION_CATACLYSM)
36-40 	5 (LE_EXPANSION_WARLORDS_OF_DRAENOR)
41-45 	6 (LE_EXPANSION_LEGION)
46-50 	7 (LE_EXPANSION_BATTLE_FOR_AZEROTH)
51-60 	8 (LE_EXPANSION_SHADOWLANDS)
==Patch changes==