Release 2.0

1. This release makes the extension useful in more use cases.

   Besides turning a non-partitioned table into a partitioned one, it can be
   used to change 1) data type of column(s), 2) order of columns, 3)
   tablespace.

2. A single function rewrite_table() is used now to handle all the use
   cases.

3. Constraints are handled in a more convenient way.

   The extension now takes care of creating the constraints on the target
   table according to the source table. The user only needs to validate the
   constrants after the rewriting has finished.

   Unlike the previous release, the rewritten table can be referenced by
   foreign key constraints.

   Note: The rewrite.check_constraints configuration variable was
   removed. If there is a risk that other users could run ALTER TABLE on
   the table during rewriting, please revoke the corresponding privileges
   from them temporarily.