chore: remove node 13.x from the matrix

Author: dmaccormack

.github/workflows/ci.yml

@@ -57,7 +57,7 @@ jobs:
     strategy:
       matrix:
         os: [macos-latest, ubuntu-latest, windows-latest]
-        node-version: [10.x, 12.x, 13.x, 14.x]
+        node-version: [10.x, 12.x, 14.x]
     steps:
     - uses: actions/checkout@v2
     - name: Set up Node.js  ${{ matrix.node-version }}