composer:
* mediawiki/mediawiki-codesniffer: 34.0.0 → 35.0.0
  The following sniffs are failing and were disabled:
  * MediaWiki.Commenting.FunctionComment.MissingParamTag
  * MediaWiki.Commenting.FunctionComment.NoParamType
  * MediaWiki.Commenting.PropertyDocumentation.MissingDocumentationPrivate

* mediawiki/minus-x: 1.1.0 → 1.1.1

npm:
* eslint-config-wikimedia: 0.17.0 → 0.18.1
  The following rules are failing and were disabled:
  * no-loss-of-precision

Additional changes:
* Added the "composer phan" command to conveniently run phan.

Change-Id: Ifd0e39bda4ff54936ac40d3195153ecd53bf3d38