use .gitignore when checking the changed files

[selul]

Description of the Change

When using a workflow where some files are ignored on git but they are present on wordpress.org SVN, it's impossible to update the readme or any assets as the svn sees the git ignored files as changed.

Verification Process

I've tested on one of our projects, here you have the run log of the action.

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

Applicable Issues

#12

[jeffpaul]

Thanks again for the PR @selul, I've milestoned this for our next release and will get back to you with any questions after this gets through review.

[helen]

See #12 for further thoughts on overall approach, I am not opposed to config although I still have a sense that going by .gitignore is not quite right.

[jeffpaul]

@10up/open-source-practice anyone feel strongly able moving this PR along or is this something we might consider closing as not the best approach for this?

[dkotter]

So this PR mentions issue #12, which has since been closed out due to PR #32. I can't quite tell if the changes made there fix the same thing mentioned here, but seems similar. I'd suggest we close this out for now and if there are still unresolved things, a new issue can be opened to track those.