upgrade to 3.0 and udpate the link in README (tensorflow#583)

fixed the package error (tensorflow#579)

Upgrade Speech commnd to tfjs 3.0.0.rc.1 (tensorflow#572)

* upgrade speech command to 3.0.0.rc1

* fixed lint error

* udpate speech-commmand deps to 3.0.0 and bump release to 0.5.0

update deeplab to tfjs 3.0.0 (tensorflow#577)

run blazeface tests in ci (tensorflow#553)

use umd for es2017 format (tensorflow#542)

face-landmarks-detection: preserve aspect ratio (tensorflow#531)

Co-authored-by: Ann Yuan <annyuan@gmail.com>

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