fix(ci): add GitHub Actions

.coveragerc

@@ -0,0 +1,2 @@
+[run]
+relative_files = True

.github/workflows/cicd.yml

@@ -0,0 +1,75 @@
+name: CI
+
+on:
+  push:
+    paths-ignore:
+      - "*.md"
+
+jobs:
+  build:
+    # For compatibility with Python 3.4
+    runs-on: ubuntu-18.04
+    strategy:
+      matrix:
+        python-version: ["3.4", "3.5", "3.6", "3.7", "3.8", "3.9", "3.10"]
+    defaults:
+      run:
+        shell: bash
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v3
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Prepare Environment
+        run: |
+          python -m pip install --upgrade pip
+          pip install pytest==3.8.2
+          pip install coveralls
+          pip install -e ".[dev]"
+
+      - name: Flake8
+        run: |
+          flake8 quaternions
+
+      - name: Tests (3.4)
+        # Avoid .coveragerc in 3.4
+        if:
+          matrix.python-version == 3.4
+        run : |
+          pytest -v tests/
+
+      - name: Tests
+        if:
+          matrix.python-version >= 3.5
+        run: |
+          pytest -v --cov=quaternions --cov-report=  tests/
+
+      - name: Publish coverage to Coveralls
+        # If pushed / is a pull request against main repo
+        if:
+          ((github.event_name == 'push' && github.repository == 'satellogic/quaternions') ||
+          github.event.pull_request.base.repo.full_name == 'satellogic/quaternions') && matrix.python-version >= 3.5
+        uses: AndreMiras/coveralls-python-action@v20201129
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          flag-name: py${{ matrix.python-version }}
+          parallel: true
+          debug: true
+
+  coveralls-finish:
+    needs: build
+    # If pushed / is a pull request against main repo
+    if:
+      (github.event_name == 'push' && github.repository == 'satellogic/quaternions') ||
+      github.event.pull_request.base.repo.full_name == 'satellogic/quaternions'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Coveralls finished
+        uses: AndreMiras/coveralls-python-action@v20201129
+        with:
+          parallel-finished: true
+          debug: true

README.md

@@ -2,7 +2,7 @@ Quaternions library
 ===================
 
 [![Coverage Status](https://coveralls.io/repos/github/satellogic/quaternions/badge.svg)](https://coveralls.io/github/satellogic/quaternions)
-[![Build Status](https://travis-ci.org/satellogic/quaternions.svg?branch=add_travis_ci)](https://travis-ci.org/satellogic/quaternions)
+[![CI](https://github.com/satellogic/quaternions/actions/workflows/cicd.yml/badge.svg)](https://github.com/satellogic/quaternions/actions/workflows/cicd.yml)
 
 This is a library for dealing with quaternions in python in a unified way.