chore(GH-action): using ubuntu 16 and removed node 8 from CI

Author: anikethsaha

.github/workflows/CI.yml

@@ -12,10 +12,10 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-16.04
     strategy:
       matrix:
-        node-version: [8.x, 10.x, 12.x]
+        node-version: [10.x, 12.x, 13.x]
 
     steps:
     - uses: actions/checkout@v1