[ci] Swapped Travis CI for GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,78 @@
+---
+
+name: Django Flat JSON Widget CI Build
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+jobs:
+
+  build:
+    name: Python==${{ matrix.python-version }} | ${{ matrix.django-version }}
+    runs-on: ubuntu-20.04
+
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version:
+          - 3.7
+          - 3.8
+        django-version:
+          - django~=3.1.0
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install npm dependencies
+      run: sudo npm install -g jshint stylelint
+
+    - name: Upgrade python system packages
+      run: pip install -U "pip==20.2.4" wheel setuptools
+
+    - name: Install openwisp-controller
+      run: |
+        pip install -U -e .[test]
+
+    - name: Install test dependencies
+      run: |
+        pip install ${{ matrix.django-version }}
+
+    - name: QA checks
+      run: |
+        ./run-qa-checks
+
+    - name: Tests
+      run: |
+        coverage run --source=flat_json_widget runtests.py
+
+    - name: Upload Coverage
+      run: coveralls --service=github
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        COVERALLS_FLAG_NAME: python-${{ matrix.python-version }}-${{ matrix.django-version }}
+        COVERALLS_PARALLEL: true
+
+  coveralls:
+    name: Finish Coveralls
+    needs: build
+    runs-on: ubuntu-latest
+    container: python:3-slim
+    steps:
+      - name: Finished
+        run: |
+          pip3 install --upgrade coveralls
+          coveralls --finish
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

README.rst

@@ -1,8 +1,8 @@
 django-flat-json-widget
 =======================
 
-.. image:: https://travis-ci.org/openwisp/django-flat-json-widget.svg
-   :target: https://travis-ci.org/openwisp/django-flat-json-widget
+.. image:: https://github.com/openwisp/django-flat-json-widget/workflows/Django%20Flat%20JSON%20Widget%20CI%20Build/badge.svg?branch=master
+   :target: https://github.com/openwisp/openwisp-controller/actions?query=workflow%3A%22Django%20Flat%20JSON%20Widget%20CI%20Build%22
    :alt: CI build status
 
 .. image:: https://coveralls.io/repos/openwisp/django-flat-json-widget/badge.svg