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:
   - npm install -g npm@^3