Fix typo in ReadableMapKeySetIterator.

Reviewed By: mkonicek

Differential Revision: D2564934

fb-gh-sync-id: 2ef1a0f5c1550d912dc751100c307659a5159fa3

ReactAndroid/src/main/java/com/facebook/react/bridge/ReadableMap.java

@@ -24,5 +24,5 @@ public interface ReadableMap {
   ReadableArray getArray(String name);
   ReadableMap getMap(String name);
   ReadableType getType(String name);
-  ReadableMapKeySeyIterator keySetIterator();
+  ReadableMapKeySetIterator keySetIterator();
 }