prepare 3.8.6

git-svn-id: https://plugins.svn.wordpress.org/leaflet-maps-marker/trunk@867088 b8457f37-d9ea-0310-8a92-e5e31aec5664
fix php notice

git-svn-id: https://plugins.svn.wordpress.org/leaflet-maps-marker/trunk@867092 b8457f37-d9ea-0310-8a92-e5e31aec5664
change stable tag to 3.8.6

git-svn-id: https://plugins.svn.wordpress.org/leaflet-maps-marker/trunk@867190 b8457f37-d9ea-0310-8a92-e5e31aec5664
update readme.txt

git-svn-id: https://plugins.svn.wordpress.org/leaflet-maps-marker/trunk@867193 b8457f37-d9ea-0310-8a92-e5e31aec5664
update readme.txt

git-svn-id: https://plugins.svn.wordpress.org/leaflet-maps-marker/trunk@867197 b8457f37-d9ea-0310-8a92-e5e31aec5664