Added removing the 3.0 and 4.0 Gemfiles to the main rake bundle:clean Rake tasks

Author: karmi

Rakefile

@@ -43,6 +43,8 @@ namespace :bundle do
     subprojects.each do |project|
       sh "rm -f #{__current__.join(project)}/Gemfile.lock"
     end
+    sh "rm -f #{__current__.join('elasticsearch-model/gemfiles')}/3.0.gemfile.lock"
+    sh "rm -f #{__current__.join('elasticsearch-model/gemfiles')}/4.0.gemfile.lock"
   end
 end