Cache persists when eslint rules have changed

[peternewnham]

The eslint-loader cache is only ever invalidated when a file is changed. This means that if you make changes to your eslint rules, the last cached lint result will still be output by eslint-loader and not the outcome based on the updated rules. The only way to fix this is to either modify each file being linted or manually delete the cache.

The entire cache should be invalidated if the eslint rules have changed.

[MoOx]

Indeed. What to make a PR for this?

[peternewnham]

I started work on a fix last night. I'll submit a PR later today for initial review so you can check my solution isn't completely crazy.

[peternewnham]

Resolved by #151