Update LKG.

Author: DanielRosenwasser

lib/lib.es2015.collection.d.ts

@@ -30,7 +30,7 @@ interface Map<K, V> {
 
 interface MapConstructor {
     new(): Map<any, any>;
-    new<K, V>(entries?: ReadonlyArray<[K, V]> | null): Map<K, V>;
+    new<K, V>(entries?: ReadonlyArray<readonly [K, V]> | null): Map<K, V>;
     readonly prototype: Map<any, any>;
 }
 declare var Map: MapConstructor;

lib/lib.es2015.iterable.d.ts

@@ -149,7 +149,7 @@ interface ReadonlyMap<K, V> {
 }
 
 interface MapConstructor {
-    new <K, V>(iterable: Iterable<[K, V]>): Map<K, V>;
+    new <K, V>(iterable: Iterable<readonly [K, V]>): Map<K, V>;
 }
 
 interface WeakMap<K extends object, V> { }