Add NestedTabularInline to README. refs theatlantic#11

Author: fdintino

README.rst

@@ -67,8 +67,12 @@ place of their django admin equivalents:
 ModelAdmin                NestedAdmin           
 InlineModelAdmin          NestedInlineModelAdmin
 StackedInline             NestedStackedInline   
+TabularInline             NestedTabularInline
 ========================  ======================
 
+Note: for consistency with the other class names, ``NestedAdmin`` will be
+deprecated in favor of ``NestedModelAdmin`` in 2.2.1, and removed in version 2.3.
+
 .. code-block:: python
 
     # An example admin.py for a Table of Contents app