Update chalk requirement from ^1.1.3 to ^2.4.1
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] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
hexojs/hexo-deployer-rsync