Update .travis.yml

.travis.yml

@@ -3,14 +3,11 @@ node_js: lts/*
 cache:
   npm: false
 before_script:
-- npm install -g gitbook-cli
 script:
-- ls Universal
-- gitbook install
-- gitbook build
-- cp icons/* _book/gitbook/images
+- yarn install
+- yarn build
 deploy:
-  local_dir: _book
+  local_dir: .vuepress/dist/
   provider: pages
   skip_cleanup: true
   name: Travis Build Bot