Added ci step to deployment

Author: s1hofmann

.travis.yml

@@ -56,7 +56,7 @@ jobs:
       osx_image: xcode11
       language: node_js
       node_js: lts/erbium
-      install: npm ci
+      install: true
       script: true
       before_deploy:
         - echo "//registry.npmjs.org/:_authToken=\${NPM_TOKEN}" >> $HOME/.npmrc 2> /dev/null
@@ -68,6 +68,6 @@ jobs:
             branch: develop
         - provider: script
           skip_cleanup: false
-          script: npm publish
+          script: npm ci && npm publish
           on:
             tags: true