Switched testing from Travis CI to Github workflows

.github/workflows/testing.yml

@@ -0,0 +1,24 @@
+name: Testing
+
+on: [pull_request, push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      max-parallel: 3
+      matrix:
+        python-version: [3.7, 3.8, 3.9]
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install tox tox-gh-actions
+    - name: Test with tox
+      run: tox

tox.ini

@@ -1,6 +1,11 @@
 [tox]
-isolated_build = true
-envlist = py36,py37,py38,mypy,pylint
+envlist = py37,py38,py39,mypy,pylint
+
+[gh-actions]
+python =
+    3.7: py37
+    3.8: py38
+    3.9: py39, mypy, pylint
 
 [testenv]
 whitelist_externals = poetry
@@ -9,13 +14,13 @@ commands =
     poetry run pytest
 
 [testenv:mypy]
-basepython = python3.8
+basepython = python3.9
 commands =
     poetry install -v
     poetry run mypy .
 
 [testenv:pylint]
-basepython = python3.8
+basepython = python3.9
 commands =
     poetry install -v
     poetry run pylint -E bpytop