Add --include-dotfiles option to allow glob to match files/dirs that begin with '.'

[protoEvangelion]

Background: https://github.com/isaacs/node-glob\#dots

My use case is I was trying to use a glob but it would not match the directory I used which begins with a ..

For example:

postcss "src/**/.sass-cache/*" --use autoprefixer --replace

This PR will pass the dot option to globby which is used by fast-glob. Here is what it will look like practically:

postcss "src/**/.sass-cache/*" --dot --use autoprefixer --replace

If user does not pass --dot nothing will change 😄 Please let me know if anything needs to be changed. Thanks for all the postcss crew does by the way. This tool is amazing!!!

[RyanZim]

Would prefer --include-dotfiles, babel uses this option name.

[RyanZim]

Also, it looks like you forgot to run npm run format to format your code with prettier.

[protoEvangelion]

@RyanZim Thanks for the feedback! How does that look?

[RyanZim]

Good; just needs npm run format to fix formatting; then commit the changes, and that should get the CI passing.

[coveralls]

Coverage increased (+0.2%) to 75.694% when pulling 8978745 on protoEvangelion:master into ca69641 on postcss:master.

[protoEvangelion]

Done, thanks for your patience 😄

[RyanZim]

Thanks!