Add LK to sourceMap.json

Author: paulsnoops

src/main/resources/sourceMap.json

@@ -56,6 +56,7 @@
       "JttRC": "Journeys through the Radiant Citadel",
       "KftGV": "Keys from the Golden Vault",
       "KKW": "Krenko's Way",
+      "LK": "Lightning Keep",
       "LLK": "Lost Laboratory of Kwalish",
       "LMoP": "Lost Mine of Phandelver",
       "LoX": "Light of Xaryxis",