ci(actions): Replace Travis CI with GitHub Actions workflow

.github/workflows/build.yml

@@ -0,0 +1,35 @@
+name: build
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    strategy:
+          matrix:
+            version:
+              - '3.6'
+              - '3.7'
+              - '3.8'
+              - '3.9'
+              - '3.10'
+              - '3.11'
+              - '3.12'
+            os: [ubuntu-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+    - name: Check out repository
+      uses: actions/checkout@v4
+
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.version }}
+
+    - name: Install package
+      run: pip install .
+
+    - name: Run tests
+      run: python -m unittest discover -v