Release 0.11.1

A patch release. The pagination-cap fixes, and the documentation that missed the
0.11.0 installer by a few minutes.

docs/UPGRADE.md is one of the documents the Windows installer puts on the server,
and its buildings-and-levels section was committed after 0.11.0 was tagged. So
0.11.0 shipped the page an operator reads WHILE upgrading without the guidance
about that upgrade - which matters most on an air-gapped box, where there is no
other way to reach it. The installer now also ships FLOOR-MAP.md for the same
reason the Windows runbooks ship.

No application code changed on the server side and the plugin contract stays at
0.20.0.

The version and the changelog are the release; the detail is in the entry.

shopdb/__init__.py

@@ -63,7 +63,7 @@ __contract_version__ = '0.20.0'
 # plugin-contract version above are distinct series with independent
 # bump rules. Not part of the shopdb.api contract surface, so it is
 # not re-exported there.
-__version__ = '0.11.0'
+__version__ = '0.11.1'
 
 
 def create_app(config_name: str = None) -> Flask: