v0.11.1

Further improve extended query support. Now the server can respond statement
describe correctly.

Added

• Add some docs.
• Add integer_datetimes parameter on startup so clients like jdbc will parse
  time types as integer.
• DescribeResponse that contains information for both ParameterDescription
  and RowDescription.

Changed

• Update do_describe of ExtendedQueryHandler. Add new bool argument
  inference_parameters to check if parameter types from statement is required
  to return.
• Updated resultset Response::QueryResponse lifetime from 'static to portal
  or query string, this allows reference of portal in stream.

Fixed

• The default implementation of ExtendedQueryHandler now correctly responds
  Close message with CloseComplete
• Correct SCRAM mechanism name in plain connection