Merge pull request #73 from PrivateStorageio/44.automatically-maintain-leases

docs/source/index.rst

docs/source/leases.rst

src/_zkapauthorizer/_plugin.py

src/_zkapauthorizer/foolscap.py

src/_zkapauthorizer/lease_maintenance.py

src/_zkapauthorizer/tests/matchers.py

src/_zkapauthorizer/tests/strategies.py

src/_zkapauthorizer/tests/test_lease_maintenance.py

src/_zkapauthorizer/tests/test_plugin.py

zkapauthorizer.nix