CI: update action's versions

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
     - uses: actions/checkout@v2
 
     - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v1
+      uses: actions/setup-node@v2
       with:
         node-version: ${{ matrix.node-version }}
 
@@ -32,6 +32,6 @@ jobs:
       run: npm run report-coveralls
 
     - name: Upload coverage report to coveralls.io
-      uses: coverallsapp/github-action@v1.1.2
+      uses: coverallsapp/github-action@master
       with:
         github-token: ${{ secrets.GITHUB_TOKEN }}