Bump to v4.15.0.

_createPadding.js

@@ -1,7 +1,7 @@
 var baseRepeat = require('./_baseRepeat'),
     baseToString = require('./_baseToString'),
     castSlice = require('./_castSlice'),
-    reHasComplexSymbol = require('./_reHasComplexSymbol'),
+    hasUnicode = require('./_hasUnicode'),
     stringSize = require('./_stringSize'),
     stringToArray = require('./_stringToArray');
 
@@ -25,7 +25,7 @@ function createPadding(length, chars) {
     return charsLength ? baseRepeat(chars, length) : chars;
   }
   var result = baseRepeat(chars, nativeCeil(length / stringSize(chars)));
-  return reHasComplexSymbol.test(chars)
+  return hasUnicode(chars)
     ? castSlice(stringToArray(result), 0, length).join('')
     : result.slice(0, length);
 }