Replace Travis CI workflow with GitHub Actions workflow; update README.

.github/workflows/lint-test-cover-docs.yml

@@ -0,0 +1,33 @@
+name: lint-test-cover-docs
+on:
+  push
+jobs:
+  lint_test_cover_docs:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.7', '3.8', '3.9']
+    name: "Python ${{ matrix.python-version }}"
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Python.
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+          architecture: x64
+      - name: Lint and test module.
+        run: |
+          pip install -U pylint coverage nose .
+          python -m pylint circuitry # Check against linting rules.
+          python -m nose --cover-erase # Test using nose.
+      - name: Publish coverage results.
+        run: |
+          pip install -U pylint coveralls
+          python -m coveralls --service=github # Submit to coveralls.
+        if: matrix.python-version == '3.8'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - name: Test auto-generation of documentation.
+        run: |
+          pip install -U -r docs/requirements.txt
+          cd docs && sphinx-apidoc -f -E --templatedir=_templates -o _source .. ../setup.py && make html && cd ..

README.rst

@@ -4,14 +4,15 @@ circuitry
 
 Embedded domain-specific combinator library for assembling abstract definitions of logic circuits.
 
-|pypi| |travis| |coveralls|
+|pypi| |actions| |coveralls|
 
 .. |pypi| image:: https://badge.fury.io/py/circuitry.svg
    :target: https://badge.fury.io/py/circuitry
    :alt: PyPI version and link.
 
-.. |travis| image:: https://travis-ci.com/nthparty/circuitry.svg?branch=main
-   :target: https://travis-ci.com/nthparty/circuitry
+.. |actions| image:: https://github.com/nthparty/circuitry/workflows/lint-test-cover-docs/badge.svg
+   :target: https://github.com/nthparty/circuitry/actions/workflows/lint-test-cover-docs.yml
+   :alt: GitHub Actions status.
 
 .. |coveralls| image:: https://coveralls.io/repos/github/nthparty/circuitry/badge.svg?branch=main
    :target: https://coveralls.io/github/nthparty/circuitry?branch=main