Update changelog for 0.12.8
Update changelog for 0.12.8

tgriesser/knex,carragom/knex,wubzz/knex,CorvusCorrax/knex,CorvusCorrax/knex,tgriesser/knex,wubzz/knex,abegines/knex,tgriesser/knex,noodle/knex,abegines/knex,carragom/knex,noodle/knex