Use AVA 3 (sindresorhus#254)

Author: fregante

.github/workflows/test.yml

@@ -11,6 +11,6 @@ jobs:
     - uses: actions/checkout@v2
     - uses: actions/setup-node@v1
       with:
-        node-version: '11.x'
+        node-version: '15.x'
     - run: npm install
     - run: npm test