The read-me.txt show a stable tag to 1.3 that you must edit in the trunk folder to be 1.4. At this time, the read-me tell I’m with a stable tag of 1.3 so go in the folder tags/1.3, and the wk-ga.php show a value of version 1.1.
You need to change the version number in wk-ga.php in your tags directory, according to the trunk (and tag too) read-me file.