Merge pull request #74 from ashenBlade/master

Thank you, @ashenBlade Fix use transactional function out of transaction

Merge pull request #72 from vibhorkum/vibhorkum-patch-1

Update pg_background.c

Merge pull request #61 from vibhorkum/vibhorkum-patch-2

Update README.md

Fixing Makefile to include upgrade sql files

Revert "Add a pg_background_discard_result() function."

This reverts commit 2299271.

Merge pull request #35 from rjuju/pg14

Fix compatibility with pg14