allow .cflint as well as .cflintrc to be used for config

[dawesi]

No idea why you need the 'rc' on the config file name, but wondering since you've made that unusual design decisions if you could also allow .cflint to be used for config file as that makes more sense and is easier to understand for other developers.

[KamasamaK]

It's not that unusual. Other linters, such as ESLint, also use the rc ending. What issue are you finding with it?