chore: use node 16 in ci (#133)

Author: vasco-santos

.github/workflows/main.yml

@@ -22,7 +22,7 @@ jobs:
     strategy:
       matrix:
         os: [windows-latest, ubuntu-latest, macos-latest]
-        node: [14, 15]
+        node: [14, 16]
       fail-fast: true
     steps:
       - uses: actions/checkout@v2
@@ -45,4 +45,4 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - run: npm install
-      - run: npx aegir test -t browser -t webworker --bail -- --browsers FirefoxHeadless
+      - run: npx aegir test -t browser -t webworker --bail -- --browsers FirefoxHeadless