testing/py3-pylint: add missing dependency
When py3-toml isn't installed the following exception is thrown:
pkg_resources.DistributionNotFound: The 'toml>=0.7.1' distribution was not found and is required by pylint
When py3-toml isn't installed the following exception is thrown:
pkg_resources.DistributionNotFound: The 'toml>=0.7.1' distribution was not found and is required by pylint