version v3.0.3

bump version string to v3.0.2

update demo/el demo/debian with all params

update v3.0.0 info on README.md

fix misc typos for v2.7.0

use https://pigsty.io instead of https://pigsty.io/en/

v2.5.1 release

doc: update feature description

update releasenote v2.4.0