Integrate GitHub Actions

.github/workflows/main.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: Testing
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the master branch
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+    - uses: actions/checkout@v2
+
+    - name: Install Python 3
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.8
+    
+    - name: Setup ANTLR 4 tool
+      uses: NiccoMlt/setup-antlr4@v0.0.5
+    
+    # Runs a set of commands using the runners shell
+    - name: Build ANTLR lexer and parser
+      run: |
+        antlr4 -Xexact-output-dir -o jasminesnake/lex -package lex -Dlanguage=Python3 -listener grammars/*.g4
+        
+    - name: Install deps from pip
+      run: |
+        python -m pip install --upgrade -rrequirements-dev.txt
+        
+    - name: Run Tox
+      run: tox