Version 1.3.1 added

git-svn-id: https://plugins.svn.wordpress.org/awesome-weather/trunk@779310 b8457f37-d9ea-0310-8a92-e5e31aec5664
Readme updates

git-svn-id: https://plugins.svn.wordpress.org/awesome-weather/trunk@779311 b8457f37-d9ea-0310-8a92-e5e31aec5664