* test: increase test case of Progress and Comment
* test: add test case for Avatar
* test: add test case for Dropdown
* fix snapshot
* fix snapshot
* remove console.log
* fix lint
* add avatar
* try: init gradient line demo
* demo(Progress): update instructions
* chore: adjust default color
* test: update case and snapshots
* docs: update description for strokeColor
* docs: update for more in written
* test: correct type of Progress
* pref: support percent for strokeColor
* test: update snapshots
* test: update case
* pref: sort key for gradients
* fix: lgtm problem
* refactor: update output of sortGradient to string
* chore: make traversal more elegant