chore: fix action

Author: kentcdodds

.github/workflows/validate.yml

@@ -5,7 +5,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest]
-        node: [10.13, 12, 14, 15]
+        node: [10.18, 12, 14, 15]
     runs-on: ${{ matrix.os }}
     steps:
       - name: ⬇️ Checkout repo