fix: check for supportedExtensions after filtering ignored files

[ullasholla]

If there are any staged files in directory containing a package.json (it doesn't need to be changed/staged), even if the directory is meant to be ignored, the function isSupportedExtension() is run. This can fail if the package.json file has invalid JSON for example (resolveConfig from prettier actually fails). Moving the filters around so that the ignored files are properly accounted for gets rid of the error.

I'm not sure if the unstaged files need to be filtered the same way: https://github.com/azz/pretty-quick/blob/f11faa91d5c570407c37ed77ac04ec0f5e0ef64e/src/index.js#L52-L59

Example repository to test this: https://github.com/ullasholla/pretty-quick-ignore-test
The templates directory contain ejs templates and the .json files are not yet valid JSON files.

To test, make a change to templates/core/config.json and stage it.

Tests are passing locally:

Could you please review and consider merging this?

Thanks!

[ullasholla]

Could I get a review for this please? @azz, maybe?

[azz]

Thanks!

[azz]

🎉 This PR is included in version 3.1.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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