[function.combine]: use es6 syntax for passed functions

src/function/combine.js

@@ -1,9 +1,7 @@
-import argsToArray from './argsToArray';
-
 /**
  * @memberOf function
  * @type {Function}
  */
-const combine = argsToArray(fns => fns.reverse().reduce((fnc, fn) => val => fnc(fn(val))));
+const combine = (...fns) => fns.reverse().reduce((fnc, fn) => val => fnc(fn(val)));
 
 export default combine;