Added "ROLE" as groupBy option for frames

diff --git a/PerfectRaid_Frames.lua b/PerfectRaid_Frames.lua
index 083fa56..0b8eaad 100644
--- a/PerfectRaid_Frames.lua
+++ b/PerfectRaid_Frames.lua
@@ -210,6 +210,7 @@ function Frames:CreateEditFrame(parent)
 		UIDropDownMenu_AddButton{text = L["None"], value = -1, func = clickFunc}
 		UIDropDownMenu_AddButton{text = L["Group"], value = "GROUP", func = clickFunc}
 		UIDropDownMenu_AddButton{text = L["Class"], value = "CLASS", func = clickFunc}
+		UIDropDownMenu_AddButton{text = L["Role"],  value = "ROLE",  func = clickFunc}
 	end
 	groupByDropDown:SetScript("OnShow", function(f)
 		UIDropDownMenu_Initialize(PRFrames_GroupByDropDown, groupByDropDown.Initialize)