feat: upgrade antlr4 to 4.12.0 (#88)

.github/workflows/nodejs.yml

@@ -9,7 +9,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [12.x, 14.x]
+        node-version: [16.x]
 
     steps:
     - uses: actions/checkout@v1
@@ -17,10 +17,11 @@ jobs:
       uses: actions/setup-node@v1
       with:
         node-version: ${{ matrix.node-version }}
-    - name: npm install, test, and build
+    - name: install, test, build
       run: |
-        npm install
-        npm test
-        npm run build
+        export NODE_OPTIONS="--max_old_space_size=4096"
+        yarn install
+        yarn test
+        yarn build
       env:
         CI: true