Replace travis with GitHub for running CI jobs (#166)

* use Github Action for executing CI jobs
* removed travis CI jobs
* removed support for Python 3.5

.github/workflows/test.yml

@@ -0,0 +1,45 @@
+name: Test
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macOS-latest, windows-latest]
+        python-version: [3.6, 3.7, 3.8]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Prepare Ubuntu
+      run: |
+        sudo apt-get update
+        sudo apt-get install --no-install-recommends -y pandoc ffmpeg
+      if: matrix.os == 'ubuntu-latest'
+    - name: Prepare OSX
+      run: brew install pandoc ffmpeg
+      if: matrix.os == 'macOS-latest'
+    - name: prepare Windows
+      run: choco install pandoc ffmpeg
+      if: matrix.os == 'windows-latest'
+    - name: Install dependencies
+      run: |
+        python -V
+        python -m pip install --upgrade pip
+        python -m pip install .
+        python -m pip install -r tests/requirements.txt
+        python -m pip install -r doc/requirements.txt
+        # This is needed in example scripts:
+        python -m pip install pillow
+    - name: Test
+      run: python -m pytest
+    - name: Test examples
+      run: python doc/examples/run_all.py
+    - name: Test documentation
+      run: python -m sphinx doc/ _build/ -b doctest

setup.py

@@ -24,14 +24,13 @@
     keywords="audio SFS WFS Ambisonics".split(),
     url="http://github.com/sfstoolbox/",
     platforms='any',
-    python_requires='>=3.5',
+    python_requires='>=3.6',
     classifiers=[
         "Development Status :: 3 - Alpha",
         "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3 :: Only",