Remove 12.x Node from workflow

Author: jorgebucaran

Diff for: .github/workflows/ci.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [12.x, 14.x]
+        node-version: [14.x, 16.x]
     steps:
     - name: Checkout
       uses: actions/checkout@v1
@@ -20,4 +20,4 @@ jobs:
         npm install -g codecov
         npm install
         npm test
-        codecov
+        codecov