Add alias normalization for "White House" as "WH" in headline processing

services/normalization.py

@@ -9,6 +9,7 @@ ALIASES = {
     'united kingdom': 'uk',
     'european union': 'eu',
     'north atlantic treaty organization': 'nato',
+    'white house': 'wh',
     'united nations': 'un',
     'international monetary fund': 'imf',
     'world trade organization': 'wto',