Update docs for recent requirements

docs/changelog.txt

 Changelog
 =========
 
+unreleased
+~~~~~~~~~~
+
+ * Python3 support
+ * Works only with Django 1.4 and Django 1.5
+
 0.9.2
 ~~~~~
 

docs/index.txt

@@ -4,8 +4,7 @@ Welcome to django-taggit's documentation!
 ``django-taggit`` is a reusable Django application designed to making adding
 tagging to your project easy and fun.
 
-``django-taggit`` works with Django 1.1 and 1.2 (see :doc:`issues` for known
-issues with older versions of Django), and Python 2.4-2.X.
+``django-taggit`` works with Django 1.4+ and Python 2.7-3.X.
 
 .. toctree::
    :maxdepth: 2
@@ -15,7 +14,6 @@ issues with older versions of Django), and Python 2.4-2.X.
    admin
    api
    custom_tagging
-   issues
    external_apps
    changelog
 

docs/issues.txt

-Known Issues
-============
-
-Currently there is 1 known issue:
-
- * When run under Django 1.1, doing ``Model.objects.all().delete()`` (or any
-   bulk deletion operation) on a model with a ``TaggableManager`` will result
-   in losing the tags for items beyond just those assosciated with the deleted
-   objects.  This issue is not present in Django 1.2.