clear trunk for 1.50

git-svn-id: https://plugins.svn.wordpress.org/wechat-subscribers-lite/trunk@958637 b8457f37-d9ea-0310-8a92-e5e31aec5664
up to 1.50

git-svn-id: https://plugins.svn.wordpress.org/wechat-subscribers-lite/trunk@958638 b8457f37-d9ea-0310-8a92-e5e31aec5664