Deleting old file

git-svn-id: https://plugins.svn.wordpress.org/article-difficulty-level/trunk@916913 b8457f37-d9ea-0310-8a92-e5e31aec5664
Article Difficulty Level version 2.2.2 - Updated to 3.8.1 new version.

git-svn-id: https://plugins.svn.wordpress.org/article-difficulty-level/trunk@916914 b8457f37-d9ea-0310-8a92-e5e31aec5664