add runtime release guidelines in the README and update the PR templa… #452

	name: Keep PR up to date

	on:
	push:
	branches:
	- main

	jobs:
	updatePullRequests:
	name: Keep PRs up to date
	runs-on: ubuntu-latest
	environment: master
	steps:
	- name: Generate token
	id: generate_token
	uses: actions/create-github-app-token@v1
	with:
	app-id: ${{ secrets.MERGE_APP_ID }}
	private-key: ${{ secrets.MERGE_APP_KEY }}
	- name: Update all the PRs
	uses: paritytech/[email protected]
	with:
	GITHUB_TOKEN: ${{ steps.generate_token.outputs.token }}

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