Add deeper stack trace in example app to test source maps

Author: adambeynon

example/app/application.rb

@@ -2,3 +2,14 @@
 require 'foo'
 
 puts "wow!"
+
+module MyApp
+  class Application
+    def initialize
+      @user = Adam.new
+      @user.bar
+    end
+  end
+end
+
+MyApp::Application.new

example/app/foo.rb

@@ -3,5 +3,3 @@ def bar
     raise "foo"
   end
 end
-
-Adam.new.bar