add testing on python 3.9

Author: tomato42

.travis.yml

@@ -44,19 +44,23 @@ matrix:
         dist: bionic
         sudo: true
       - python: 3.8
+        env: TOX_ENV=py38
+        dist: bionic
+        sudo: true
+      - python: 3.9
         env: TOX_ENV=codechecks
         dist: bionic
         sudo: true
-      - python: 3.8
-        env: TOX_ENV=py38
+      - python: 3.9
+        env: TOX_ENV=py39
         dist: bionic
         sudo: true
-      - python: 3.8
-        env: TOX_ENV=gmpypy38
+      - python: 3.9
+        env: TOX_ENV=gmpypy39
         dist: bionic
         sudo: true
-      - python: 3.8
-        env: TOX_ENV=gmpy2py38
+      - python: 3.9
+        env: TOX_ENV=gmpy2py39
         dist: bionic
         sudo: true
       - python: nightly

tox.ini

@@ -1,6 +1,6 @@
 
 [tox]
-envlist = py26, py27, py33, py34, py35, py36, py37, py38, py, pypy, pypy3, gmpy2py27, gmpy2py38, gmpypy27, gmpypy38, codechecks
+envlist = py26, py27, py33, py34, py35, py36, py37, py38, py39, py, pypy, pypy3, gmpy2py27, gmpy2py39, gmpypy27, gmpypy39, codechecks
 
 [testenv]
 deps =
@@ -10,12 +10,12 @@ deps =
      py{33}: hypothesis<3.44
      py{26}: unittest2
      py{26}: hypothesis<3
-     py{26,27,34,35,36,37,38,py,py3}: pytest
-     py{27,34,35,36,37,38,py,py3}: hypothesis
-     gmpy2py{27,38}: gmpy2
-     gmpypy{27,38}: gmpy
-     gmpy{2py27,2py38,py27,py38}: pytest
-     gmpy{2py27,2py38,py27,py38}: hypothesis
+     py{26,27,34,35,36,37,38,39,py,py3}: pytest
+     py{27,34,35,36,37,38,39,py,py3}: hypothesis
+     gmpy2py{27,39}: gmpy2
+     gmpypy{27,39}: gmpy
+     gmpy{2py27,2py39,py27,py39}: pytest
+     gmpy{2py27,2py39,py27,py39}: hypothesis
 # six==1.9.0 comes from setup.py install_requires
      py27_old_six: six==1.9.0
      py27_old_six: pytest
@@ -46,14 +46,14 @@ basepython = python2.7
 [testenv:gmpypy27]
 basepython=python2.7
 
-[testenv:gmpypy38]
-basepython=python3.8
+[testenv:gmpypy39]
+basepython=python3.9
 
 [testenv:gmpy2py27]
 basepython=python2.7
 
-[testenv:gmpy2py38]
-basepython=python3.8
+[testenv:gmpy2py39]
+basepython=python3.9
 
 [testenv:coverage]
 sitepackages=True