Add Github Actions regresion testing

.github/workflows/regression-tests.yml

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+name: Regression Tests
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: Python ${{matrix.python-version}}
+    runs-on: ubuntu-20.04
+    
+    strategy:
+      matrix:
+        python-version: [3.6, 3.7, 3.8, 3.9]
+
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install Icarus Verilog
+      run: |
+        sudo apt install -y --no-install-recommends iverilog
+
+    - name: Install Python dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install tox tox-gh-actions
+
+    - name: Test with tox
+      run: tox

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+
+*.egg-info/
+.installed.cfg
+*.egg
+
+
+.tox
+sim_build_*

setup.cfg

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+[tox:tox]
+envlist = py36, py37, py38, py39
+
+[gh-actions]
+python =
+    3.6: py36
+    3.7: py37
+    3.8: py38
+    3.9: py39
+
+[testenv]
+deps =
+    pytest
+    pytest-xdist
+    cocotb-test
+
+commands =
+    pytest -n auto