Added changelog for v0.12 (boa-dev#1275)

Changelog v0.11 (boa-dev#1052)

v0.11
Co-authored-by: João Borges <rageknify@gmail.com>
Co-authored-by: Iban Eguia <iban.eguia@cern.ch>

update publish action to run from boa dir

0.9.0

cargo update

0.5.1

hacktoberfest release

adding CHANGELOG