ci(github actions): add node 14 to the versions being tested

Author: Addono

.github/workflows/test.yaml

@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [12.x, 13.x]
+        node-version: [12.x, 13.x, 14.x]
 
     steps:
       - uses: actions/checkout@722adc6 # v2