Log Message:
erlang-p1_pgsql: Update to 1.1.11

upstream changes:
-----------------
Version 1.1.11
  o Update copyright year to 2021
  o recv_byte returns {ok, _} or throws an error, but never returns {error, _}

Version 1.1.10
  o Fix Coveralls command call
  o Fix Travis setup using Rebar3

Version 1.1.9
  o Update copyright to 2020

Version 1.1.8
  o Update for hex.pm release

Version 1.1.7
  o Add contribution guide