Fix SQLite datatype name: it is REAL, not FLOAT. Found by Richard Kelsall on docs@.

Doc/library/sqlite3.rst

@@ -174,7 +174,7 @@ Module functions and constants
    For the *isolation_level* parameter, please see the
    :attr:`Connection.isolation_level` property of :class:`Connection` objects.
 
-   SQLite natively supports only the types TEXT, INTEGER, FLOAT, BLOB and NULL. If
+   SQLite natively supports only the types TEXT, INTEGER, REAL, BLOB and NULL. If
    you want to use other types you must add support for them yourself. The
    *detect_types* parameter and the using custom **converters** registered with the
    module-level :func:`register_converter` function allow you to easily do that.