💚 use Node.js 14 instead of Node.js stable.

Author: kayo5994

UI_dev/qmui_web/.travis.yml

@@ -6,7 +6,7 @@ cache:
     - node_modules
 node_js:
   - "10.15.1"
-  - "stable"
+  - "14"
 before_install:
   - curl -o- -L https://yarnpkg.com/install.sh | bash -s -- --version 1.15.2
   - export PATH="$HOME/.yarn/bin:$PATH"