update to 7.0.0

cheroot-fix-setup-python3.patch

---- a/setup.cfg	2018-12-27 20:35:11.000000000 +0100
-+++ b/setup.cfg	2019-01-02 10:19:34.658391238 +0100
-@@ -57,7 +57,7 @@ setup_requires =
- 	setuptools_scm>=1.15.0
- 	setuptools_scm_git_archive>=1.0
- install_requires = 
--	backports.functools_lru_cache
-+	backports.functools_lru_cache; python_version<"3.4.0"
- 	six>=1.11.0
- 	more_itertools>=2.6