Update chalk requirement from ^1.1.3 to ^2.4.1

Updates the requirements on [chalk](https://github.com/chalk/chalk) to permit the latest version.
- [Release notes](https://github.com/chalk/chalk/releases)
- [Commits](https://github.com/chalk/chalk/commits/v2.4.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot-support

package.json

@@ -33,7 +33,7 @@
   "dependencies": {
     "abbrev": "^1.0.7",
     "bluebird": "^3.4.0",
-    "chalk": "^1.1.3",
+    "chalk": "^2.4.1",
     "command-exists": "^1.2.0",
     "hexo-fs": "^0.2.0",
     "hexo-log": "^0.2.0",