Hygiene: Add .node-version to .gitignore
Hygiene: Add .node-version to .gitignore

We can ignore .node-version, which is generated by nodenv when using an
alternate repo-local node version.

Change-Id: I9f4a0b170dc90170d86d4c0a3e23348ddc1b92d8

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