Update tox.ini (#34)

* Update tox.ini
* Update test_and_deploy.yml

Author: MMathisLab

.github/workflows/test_and_deploy.yml

@@ -21,7 +21,7 @@ jobs:
     strategy:
       matrix:
         platform: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: [3.9, "3.10"]
+        python-version: [3.9]
 
     steps:
       - uses: actions/checkout@v2

tox.ini

@@ -1,10 +1,11 @@
 # For more information about tox, see https://tox.readthedocs.io/en/latest/
 [tox]
-envlist = py{39}-{linux,macos,windows}
+envlist = py{38,39}-{linux,macos,windows}
 isolated_build=true
 
 [gh-actions]
 python =
+    3.8: py38
     3.9: py39
 
 [gh-actions:env]
@@ -21,7 +22,6 @@ platform =
 passenv =
     CI
     GITHUB_ACTIONS
-    DISPLAY XAUTHORITY
     NUMPY_EXPERIMENTAL_ARRAY_FUNCTION
     PYVISTA_OFF_SCREEN
 extras =