update appveyor.yml

appveyor.yml

@@ -1,17 +1,20 @@
 version: 'test-{build}'
 environment:
   matrix:
-    - nodejs_version: '4'
     - nodejs_version: '6'
     - nodejs_version: '8'
+    - nodejs_version: '10'
 platform:
   - x86
   - x64
 clone_folder: 'c:\projects\%APPVEYOR_PROJECT_NAME%'
 install:
   - ps: 'Install-Product node $env:nodejs_version $env:platform'
+  - ps: '$NpmVersion = (npm -v).Substring(0,1)'
+  - ps: 'if($NpmVersion -eq 5) { npm install -g npm@5 }'
+  - ps: npm --version
   - npm install
-  - npm install winston@2.3.0
+  - npm install winston@3.2.1
   - 'npm install https://github.com/ioBroker/ioBroker.js-controller/tarball/master --production'
 test_script:
   - echo %cd%