Update Vue.js documentation (2.1.8, 1.0.28)

lib/docs/scrapers/vue.rb

@@ -18,7 +18,7 @@ module Docs
     HTML
 
     version '2' do
-      self.release = '2.1.3'
+      self.release = '2.1.8'
       self.base_url = 'https://vuejs.org/v2/'
       self.root_path = 'guide/index.html'
       self.initial_paths = %w(api/index.html)