Add back getParamNames tests

Author: mjackson

modules/__tests__/getParamNames-test.js

@@ -1,7 +1,7 @@
 import expect from 'expect';
 import { getParamNames } from '../PatternUtils';
 
-describe.skip('getParamNames', function () {
+describe('getParamNames', function () {
   describe('when a pattern contains no dynamic segments', function () {
     it('returns an empty array', function () {
       expect(getParamNames('a/b/c')).toEqual([]);