Fix get_latest_version of Jest

Author: MasterEnoc

lib/docs/scrapers/jest.rb

@@ -19,8 +19,8 @@ class Jest < UrlScraper
     HTML
 
     def get_latest_version(opts)
-      doc = fetch_doc('https://jestjs.io/docs/en/getting-started', opts)
-      doc.at_css('header > a > h3').content
+      doc = get_latest_github_release('facebook', 'jest', opts)
     end
+
   end
 end