Log Message:
audio/librespot: update to 0.2.0

BREAKING CHANGES

-Migrate to tokio 1.0. This required a wholesale refactor of the librespot
codebase (#606 #649 #658 #665 #674 #687 #691)
-Replaced fn instances with const in version.rs (#595)
-Option to choose between track and album normalisation added. Defaults to
album, was previously disabled by default (#573)

Features:
-Add preload event for new track playing soon (#546)
-Ogg passthrough support (#569 #664)
-Add high resolution audio control & normalisation (#660)
-Add shuffle command handling (#666 #708)
-Add cache size limit (#675)

Bug fixes:
-Fix streaming mode (#693)
-Fix normalisation (#698)
-Fix rodio warning for alsa (#696)

Maintenance:
-Bump MSRV to 1.48
-Bump dependencies (#710)
-Clean up imports (#652 #667 #668)
-Update examples (#663)
-Change panic! to error! when child process fails to start (onevent program)
(#684)
-Reduce boilerplate (#699)