Update Node versions used in CI

Author: gabmontes

.travis.yml

@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-  - "12.0.0"
+  - 14
 
 notifications:
   email: false

appveyor.yml

@@ -12,7 +12,7 @@ cache:
   - '%USERPROFILE%\.electron'
 
 install:
-  - ps: Install-Product node 12.0.0
+  - ps: Install-Product node 14
   - npm i --global --production windows-build-tools@4
   - npm i
 
@@ -22,7 +22,7 @@ platform:
 build_script:
   - npm run dist
 
-test: "off"
+test: false
 
 for:
 -