Bump to v4.15.0.

replace.js

@@ -1,11 +1,5 @@
 import toString from './toString.js';
 
-/** Used for built-in method references. */
-var stringProto = String.prototype;
-
-/* Built-in method references for those with the same name as other `lodash` methods. */
-var nativeReplace = stringProto.replace;
-
 /**
  * Replaces matches for `pattern` in `string` with `replacement`.
  *
@@ -29,7 +23,7 @@ function replace() {
   var args = arguments,
       string = toString(args[0]);
 
-  return args.length < 3 ? string : nativeReplace.call(string, args[1], args[2]);
+  return args.length < 3 ? string : string.replace(args[1], args[2]);
 }
 
 export default replace;