Update plan

[poppinlp]

Hi. I think there could be some updates. Here's my plan:

• Add help information for CLI
• Support more configuration file formats such as yaml (I have seen .yaml-lint.json in code but this not mentioned in docs. We may update docs)
• Add test cases for CLI since we only have test cases for linter right now.

I don't know what you think, so I haven't started this yet.
Wait for your reply~ Wish not bother you too much. :)

[rasshofer]

First of all, thank you very much for your ongoing effort and dedication, highly appreciated!

Regarding your ideas/plans: I already added some documentation regarding how to specify options with 547f5e0, but if you like you could implement the test cases for the CLI, that would be amazing! :)

[poppinlp]

OK, i'll add the test cases for the CLI.
And maybe you could active this repo on coveralls or something like it, so that we can update the code coverage by CI and show it by badge. (I don't have the permission to do this)

[rasshofer]

Coveralls has already been enabled: https://coveralls.io/github/rasshofer/yaml-lint :)

[poppinlp]

Hi, i've add test cases in this PR.