Add a Changes object to the PullRequestEvent object so we can see what changed in edited PR events #391

	name: Dart Checks

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	jobs:
	build:
	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	os: [ubuntu-latest]
	# Test with at least the declared minimum Dart version
	sdk: [2.18.7, stable]
	steps:
	- uses: actions/checkout@v3
	- uses: dart-lang/setup-dart@v1
	with:
	sdk: ${{ matrix.sdk }}

	- name: Install dependencies
	run: dart pub get
	- name: Dart Analyzer
	run: dart analyze
	- name: Check Dart Format
	if: ${{ matrix.sdk == 'stable' }}
	run: dart format --set-exit-if-changed -onone .
	- name: Unit tests
	run: dart test
	- name: Check if Publishable
	run: dart pub publish --dry-run

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