bug: the number of articles returned invalid since the api_key is not posted on freeguestpost api

git-svn-id: https://plugins.svn.wordpress.org/free-guest-post/trunk@862884 b8457f37-d9ea-0310-8a92-e5e31aec5664
updating changelog getting ready for version 1.2.6

git-svn-id: https://plugins.svn.wordpress.org/free-guest-post/trunk@862903 b8457f37-d9ea-0310-8a92-e5e31aec5664