Replace Travis with GitHub Actions

.github/workflows/python-package.yml

@@ -0,0 +1,42 @@
+# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python
+
+name: Python package
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "pypy3.9", "pypy3.10"]
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        sudo apt-get install -y ffmpeg # libopus-dev python-scipy python3-scipy
+        python -m pip install --upgrade pip
+        python -m pip install pylama
+        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+    - name: Lint
+      continue-on-error: true
+      run: |
+        # stop the build if there are Python syntax errors or undefined names
+        #flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
+        # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
+        #flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+        python -m pylama -i W,E501 pydub/
+    - name: Test
+      if: always()
+      run: |
+        python test/test.py

README.markdown

@@ -1,4 +1,4 @@
-# Pydub [![Build Status](https://travis-ci.org/jiaaro/pydub.svg?branch=master)](https://travis-ci.org/jiaaro/pydub) [![Build status](https://ci.appveyor.com/api/projects/status/gy1ucp9o5khq7fqi/branch/master?svg=true)](https://ci.appveyor.com/project/jiaaro/pydub/branch/master)
+# Pydub [![GitHub Actions](https://github.com/abitrolly/pydub/actions/workflows/python-package.yml/badge.svg)](https://github.com/abitrolly/pydub/actions/workflows/python-package.yml) [![Build status](https://ci.appveyor.com/api/projects/status/gy1ucp9o5khq7fqi/branch/master?svg=true)](https://ci.appveyor.com/project/jiaaro/pydub/branch/master)
 
 Pydub lets you do stuff to audio in a way that isn't stupid.