sources.rb in licensed-2.8.0

- old
+ new

@@ -13,7 +13,8 @@
     require "licensed/sources/npm"
     require "licensed/sources/pip"
     require "licensed/sources/pipenv"
     require "licensed/sources/gradle"
     require "licensed/sources/mix"
+    require "licensed/sources/yarn"
   end
 end