language: node_js
node_js:
  - "6"
  - "8"
  - "10"
  - "11"

language: node_js
node_js:
  - "6"
  - "8"
  - "10"
  - "12"
  - "13"

Add node 12, 13 to test coverage matrix
Add node 12, 13 to test coverage matrix
