Paul Klimov just tagged two extension releases: HTTP client 2.0.1 and Auth Client 2.1.0.
You can get ideas on what was changed in both via news at the main website:
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http://www.yiiframework.com/news/104/http-client-extension-version-2-0-1-released/
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http://www.yiiframework.com/news/105/auth-client-extension-version-2-1-0-released/
Note that Auth Client release is a major one which, most probably, will break backwards compatibility so make sure to either set Composer constraints to use 2.0 versions or check its upgrade guide.