[PATCH] Update tox.ini for python3.8 and fix pypy3.6

[Floris Bruynooghe]

Python 3.8 has been released for a while now, make sure we keep
supporting it correctly.

PyPy 3.6 wasn not configured correctly.
---
 bindings/python-cffi/tox.ini | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/bindings/python-cffi/tox.ini b/bindings/python-cffi/tox.ini
index 34148a11..7cf93be0 100644
--- a/bindings/python-cffi/tox.ini
+++ b/bindings/python-cffi/tox.ini
@@ -3,7 +3,7 @@ minversion = 3.0
 addopts = -ra --cov=notmuch2 --cov=tests
 
 [tox]
-envlist = py35,py36,py37,pypy35,pypy36
+envlist = py35,py36,py37,py38,pypy35,pypy36
 
 [testenv]
 deps =
@@ -14,3 +14,6 @@ commands = pytest --cov={envsitepackagesdir}/notmuch2 {posargs}
 
 [testenv:pypy35]
 basepython = pypy3.5
+
+[testenv:pypy36]
+basepython = pypy3.6
-- 
2.27.0