Add .eslintcache to gitignore
Add .eslintcache to gitignore

I ran eslint locally and it created that file in my repo.

Change-Id: Ic30edcb3ed24be9c9cabdd41d9b365b0b79dca58

wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps