Add 3.9 to test environments

Author: aiudirog

.github/workflows/tests.yml

@@ -33,7 +33,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python: ['3.6', '3.7', '3.8']
+        python: ['3.6', '3.7', '3.8', '3.9']
     steps:
       - uses: actions/checkout@v1
       - name: Setup Build Tools

.gitignore

@@ -6,4 +6,5 @@ dist/
 httpx_gssapi.egg-info/
 venv*/
 .idea/
+.tox/
 

requirements.txt

@@ -1,3 +1,3 @@
-httpx
+httpx~=0.16.1
 gssapi
 pytest

setup.cfg

@@ -12,6 +12,7 @@ classifiers =
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
     Topic :: Software Development :: Libraries :: Python Modules
 keywords =
     httpx
@@ -24,7 +25,7 @@ python_requires = >=3.6
 packages = httpx_gssapi
 tests_require = pytest
 install_requires =
-    httpx
+    httpx~=0.16.1
     gssapi
 
 [options.package_data]
@@ -56,7 +57,26 @@ build-dir = doc/build/
 [flake8]
 max-line-length = 80
 filename = httpx_gssapi/**.py
-exclude = tests,build,dist,venv,.tox,*.egg*,coverage,doc,httpx_gssapi/_version.py
+exclude =
+    tests,
+    build,
+    dist,
+    venv,
+    .tox,
+    *.egg*,
+    coverage,
+    doc,
+    httpx_gssapi/_version.py
+
+[tox:tox]
+envlist = py36, py37, py38, py39
+
+[testenv]
+deps =
+    pytest
+    k5test
+commands =
+    python -m pytest
 
 [versioneer]
 VCS = git