Renamed 'Introduction' to 'Introduction.md' for better consistency #232

	jobs:
	lint-changelog:
	name: Lint changelog file
	runs-on: ubuntu-latest
	steps:
	- name: Check out code
	uses: actions/checkout@v2

	- name: Lint changelog file
	uses: docker://avtodev/markdown-lint:v1
	with:
	rules: '/lint/rules/changelog.js'
	config: '/lint/config/changelog.yml'
	args: './CHANGELOG.md'

	# Or using current repository as action:

	- name: Lint changelog file
	uses: avto-dev/markdown-lint@v1
	with:
	rules: '/lint/rules/changelog.js'
	config: '/lint/config/changelog.yml'
	args: './CHANGELOG.md'

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