docs: update change log

chore: change version

chore: change version

chore: change version

fix(0.8.4): fix performance problem in firefox

docs: update changelog

test: add test for v0.8.2

fix: 🐞 Fix bug of parser style error when using IE6 and 7 csshack

feat: fix bug of scopecss & peffect unit test

chore: change version