新增nodejs版本输出

Author: lyswhut

.travis.yml

@@ -3,16 +3,14 @@ matrix:
     - os: osx
       osx_image: xcode10.2
       language: node_js
-      node_js:
-        - 12
+      node_js: 12
       env:
         - ELECTRON_CACHE=$HOME/.cache/electron
         - ELECTRON_BUILDER_CACHE=$HOME/.cache/electron-builder
 
     - os: linux
       language: node_js
-      node_js:
-        - 12
+      node_js: 12
       dist: trusty
       services: docker
       language: generic
@@ -28,6 +26,8 @@ notifications:
   email: false
 
 script:
+  - node --version
+  - npm --version
   - |
     if [ "$TRAVIS_OS_NAME" == "linux" ]; then
       npm install && npm run publish:gh:linux