Drop support for Python 3.6

These days pygit2 requires Python >= 3.7:

https://pypi.org/project/pygit2/

So reluctantly drop support for 3.6.  If anyone can figure out a way
of bringing it back (e.g. via using old versions of pygit2 where
necessary), we could consider doing that.

1 files changed, 1 insertions, 1 deletions

diff --git a/tox.ini b/tox.ini
index 603568e..89f5094 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,7 +3,7 @@
 
 [tox]
 minversion = 1.8
-envlist = py36,py37,py38,flake8
+envlist = py37,py38,flake8
 skip_missing_interpreters = True
 
 [testenv]