update shellcheck v0.7.0
update shellcheck v0.7.0

full diff: https://github.com/koalaman/shellcheck/compare/v0.6.0...v0.7.0

Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

docker/cli,docker/cli,thaJeztah/cli,cpuguy83/cli,thaJeztah/cli,cpuguy83/cli