Update npm modules and drop support for Node.js 10 (#196)

Following packages have been updated:

* eslint
* eslint-config-wikimedia
* mocha

.github/workflows/node.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-v: [10.x, 12.x, 14.x, 16.x]
+        node-v: [12.x, 14.x, 16.x]
     steps:
       - name: Checkout
         uses: actions/checkout@v2