Update REAMDE on back-end changes

Author: Photonios

README.rst

@@ -35,14 +35,14 @@ Installation
             'localized_fields'
         ]
 
-3. Set the database engine to ``localized_fields.db_backend``:
+3. Set the database engine to ``psqlextra.backend``:
 
     .. code-block:: python
 
         DATABASES = {
             'default': {
                 ...
-                'ENGINE': 'localized_fields.db_backend'
+                'ENGINE': 'psqlextra.backend'
             }
         }
 
@@ -247,34 +247,26 @@ Besides ``LocalizedField``, there's also:
 Frequently asked questions (FAQ)
 --------------------------------
 
-1. Why do I need to change the database back-end/engine?
-
-    We utilize PostgreSQL's `hstore` data type, which allows you to store key-value pairs in a column.  In order to create `UNIQUE` constraints on specific key, we need to create a special type of index. We could do this without a custom database back-end, but it would require everyone to manually write their migrations. By using a custom database back-end, we added support for this. When changing the `uniqueness` constraint on a `LocalizedField`, our custom database back-end takes care of creating, updating and deleting these constraints/indexes in the database.
-
-2. I am already using a custom database back-end, can I still use yours?
-
-    Yes. You can set the ``LOCALIZED_FIELDS_DB_BACKEND_BASE`` setting to your current back-end. This will instruct our custom database back-end to inherit from the database back-end you specified. **Warning**: this will only work if the base you specified indirectly inherits from the standard PostgreSQL database back-end.
-
-3. Does this package work with Python 2?
+1. Does this package work with Python 2?
 
     No. Only Python 3.5 or newer is supported. We're using type hints. These do not work well under older versions of Python.
 
-4. Does this package work with Django 1.X?
+2. Does this package work with Django 1.X?
 
     No. Only Django 1.10 or newer is supported. This is because we rely on Django's ``HStoreField``.
 
-5. Does this package come with support for Django Admin?
+3. Does this package come with support for Django Admin?
 
     Yes. Our custom fields come with a special form that will automatically be used in Django Admin if the field is of ``LocalizedField``.
 
-7. Why should I pick this over any of the other translation packages out there?
+4. Why should I pick this over any of the other translation packages out there?
 
     You should pick whatever you feel comfortable with. This package stores translations in your database without having to have translation tables. It however only works on PostgreSQL.
 
-8. I am using PostgreSQL <8.4, can I use this?
+5. I am using PostgreSQL <9.6, can I use this?
 
-    No. The ``hstore`` data type was introduced in PostgreSQL 8.4.
+    No. The ``hstore`` data type was introduced in PostgreSQL 9.6.
 
-9. I am using this package. Can I give you some beer?
+6. I am using this package. Can I give you some beer?
 
     Yes! If you're ever in the area of Cluj-Napoca, Romania, swing by :)