net/py-twitter-tools: Update to 1.15.0

- Update to 1.15.0
- Add LICENSE_FILE
- Add TEST_DEPENDS and regression-test: target
- Remove GH_PROJECT (value is now the default)
- Patch tests_require and test_suite into setup.py, send upstream [1]

[1] https://github.com/sixohsix/twitter/pull/272


git-svn-id: svn+ssh://svn.freebsd.org/ports/head@375613 35697150-7ecd-e111-bb59-0022644237b5