Migrate from Travis to GitHub Actions

.github/workflows/main.yml

@@ -0,0 +1,33 @@
+name: Main
+
+on:
+  - pull_request
+  - push
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version:
+          - 3.6
+          - 3.7
+          - 3.8
+          - 3.9
+
+    steps:
+    - name: Clone Repository
+      uses: actions/checkout@v1
+
+    - name: Setup Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install Tox
+      run: |
+        python -m pip install --upgrade pip
+        pip install tox tox-gh-actions
+
+    - name: Invoke Tox
+      run: tox

.travis.yml

@@ -1,10 +0,0 @@
-dist: xenial
-sudo: required
-language: python
-python:
-  - "3.6"
-  - "3.7"
-  - "3.8"
-  - "3.9"
-install: pip install tox-travis
-script: tox

tox.ini

@@ -5,7 +5,7 @@ envlist =
     py38
     py39
 
-[travis]
+[gh-actions]
 python =
     3.6: py36
     3.7: py37