developer-setup: Mention the current mypy version we use
To avoid discrepancy with tox when pre-commit is triggered.
Related to swh/infra/sysadm-environment#3746 (closed)
Migrated from D7054 (view on Phabricator)
To avoid discrepancy with tox when pre-commit is triggered.
Related to swh/infra/sysadm-environment#3746 (closed)
Migrated from D7054 (view on Phabricator)