Build: Add node 12 & 14 to matrix

Author: phated

.travis.yml

@@ -1,6 +1,8 @@
 sudo: false
 language: node_js
 node_js:
+  - '14'
+  - '12'
   - '10'
   - '8'
   - '6'

appveyor.yml

@@ -10,6 +10,8 @@ environment:
     - nodejs_version: "6"
     - nodejs_version: "8"
     - nodejs_version: "10"
+    - nodejs_version: "12"
+    - nodejs_version: "14"
 
 install:
   - ps: Install-Product node $env:nodejs_version