Unset EDITOR env var in test_run_hook_edit (#256)
Unset EDITOR env var in test_run_hook_edit (#256)

Without this the test will fail if the EDITOR env var is set to
something different than 'vim -n'.

Co-authored-by: Joris Roovers <d3c1d34e78cecd35a72fbd13062bc17b02a9dc40@gmail.com>
jorisroovers/gitlint,jorisroovers/gitlint