Bump time-grunt from 1.4.0 to 2.0.0

Bumps [time-grunt](https://github.com/sindresorhus/time-grunt) from 1.4.0 to 2.0.0.
- [Release notes](https://github.com/sindresorhus/time-grunt/releases)
- [Commits](sindresorhus/time-grunt@v1.4.0...v2.0.0)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -30,7 +30,7 @@
     "karma-mocha": "^2.0.1",
     "load-grunt-tasks": "^3.3.0",
     "mocha": "^2.3.3",
-    "time-grunt": "^1.0.0"
+    "time-grunt": "^2.0.0"
   },
   "dependencies": {
     "eventemitter2": "^6.4.0",