Clarify the dependencies in README.md #1285

	name: Space Check

	on:
	pull_request:
	branches:
	- 'OVIS-4'
	- main
	- 'b[0-9]+.[0-9]+'

	jobs:
	space_check:
	runs-on: ubuntu-20.04
	steps:
	- uses: actions/checkout@v3
	- run: \|
	set -e
	test -n "${GITHUB_BASE_REF}"
	git fetch origin "${GITHUB_BASE_REF}:refs/remotes/origin/${GITHUB_BASE_REF}"
	echo "=== Creating /tmp/diff ==="
	git diff "origin/${GITHUB_BASE_REF}" > /tmp/diff
	echo "=== Checking trailing spaces in /tmp/diff ==="
	if grep '^+.*[[:space:]]$' /tmp/diff ; then
	echo "---------------------------------------"
	echo "Pull request contains trailing spaces"
	exit -1
	else
	echo "---------------------------------------"
	echo "OK."
	exit 0
	fi

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