Update Angular documentation (4.4.4)

Author: Thibaut

lib/docs/scrapers/angular.rb

@@ -16,7 +16,7 @@ class Angular < UrlScraper
     HTML
 
     version do
-      self.release = '4.4.1'
+      self.release = '4.4.4'
       self.base_url = 'https://angular.io/'
       self.root_path = 'docs'