Remove test on node 8, 9 - only support actively maintained versions.

Author: jgm

.github/workflows/ci.yml

@@ -14,8 +14,6 @@ jobs:
           - node: '12.x'
           - node: '11.x'
           - node: '10.x'
-          - node: '9.x'
-          - node: '8.x'
     steps:
       - uses: actions/checkout@v1
       - name: Use Node.js