v2.0.0-beta.4

Bug Fixes

• fix: delete song exception in random mode (711d561)
• fix: can not overwrite playlist (204bd40)
• fix: types (91d3cea)
• fix: ios9 (cd87e5b)
• fix: ssr (1024ab1)

Features

• feat(types): add switch api (e45b7eb)

Improve

• perf: improve loading status on mobile (74d6808) (bc3f47e)
• refactor: prettier code (7f63c86)
• docs: update vuepress (027c6c4)