Update readme/changelog

Author: leplatrem

CHANGES

@@ -6,7 +6,10 @@ CHANGELOG
 0.18.3 (unreleased)
 -------------------
 
--
+**New features**
+
+- Added ``leaflet.admin.LeafletGeoAdminMixin``, useful for stacked or tabular
+  inline forms (thanks @KostyaEsmukov, @Xowap)
 
 
 0.18.2 (2016-08-16)

README.rst

@@ -369,6 +369,17 @@ In Adminsite
     admin.site.register(WeatherStation, LeafletGeoAdmin)
 
 
+A mixin is also available for inline forms:
+
+::
+
+    from django.contrib import admin
+    from leaflet.admin import LeafletGeoAdminMixin
+
+    class PoiLocationInline(LeafletGeoAdminMixin, admin.StackedInline):
+        model = PoiLocation
+
+
 In forms
 ~~~~~~~~