fix travis.yml deploy

Author: senid231

.travis.yml

@@ -29,6 +29,7 @@ jobs:
       script: bundle exec rake default
     - name: "Deploy documentation"
       stage: deploy
+      install: skip
       before_script: yarn install
       script: yarn docs:build
       deploy:

package.json

@@ -2,5 +2,8 @@
   "scripts": {
     "docs:dev": "vuepress dev docs",
     "docs:build": "vuepress build docs"
+  },
+  "devDependencies": {
+    "vuepress": "^1.4.1"
   }
 }