Add subdivision doku to readme

Author: Benjamin Pick

changelog.txt

@@ -1,11 +1,5 @@
 == Old Changelog ==
 
-= 2.9.0 =
-* NEW: Wizard to get the right ip adress (in order to simplify reverse proxy configuration).
-* The reverse proxy logic was heavily changed. If you run into configuration errors, try the wizard.
-* NEW: The CSS classes that are added to the body-tag (if enabled in the options) now also include the most specific subdivisino (province).
-* Maxmind vendor code was updated to the current version (2.8.0).
-
 = 2.8.2 =
 * Maxmind vendor code was updated to the current version (2.7.0).
 * FIX: There was a fatal error when using PHP 7.2 (thx jj-dev)

geoip-detect.php

@@ -16,7 +16,7 @@
 Requires PHP:    5.4
 */
 
-define('GEOIP_DETECT_VERSION', '2.8.2');
+define('GEOIP_DETECT_VERSION', '2.9.0');
 
 /*
 Copyright 2013-2018 Yellow Tree, Siegen, Germany

readme.txt

@@ -103,6 +103,11 @@ There have been changes to the reverse proxy logic. If you have enabled a revers
 
 == Changelog ==
 
-= 2.9.1 =
+= 2.9.0 =
+* NEW: Wizard to get the right ip adress (in order to simplify reverse proxy configuration).
+* The reverse proxy logic was heavily changed. If you run into configuration errors, try the wizard.
+* NEW: The CSS classes that are added to the body-tag (if enabled in the options) now also include the most specific subdivisino (province).
+* NEW: Shortcodes now support multiple subdivisions (`[geoip_detect2 property="subdivisions.0.isoCode"]`)
+* Maxmind vendor code was updated to the current version (2.8.0).
 
 [Older changelog](https://github.com/yellowtree/wp-geoip-detect/blob/master/CHANGELOG.md)