libspot(ffi)-v2.0.0-beta.5.0

What's Changed

• chore(doc): remove old link by @shenxiangzhuang in #11
• change(ffi): use usize in ffi binding by @shenxiangzhuang in #12
• libspot(ffi) bump version to 2.0b5 by @shenxiangzhuang in #13

Full Changelog: libspot-rs-v0.1.0...libspot(ffi)-v2.0.0-beta.5.0