Bump version to 2.2.9

Bump version to 2.2.8

Merge pull request LoopKit#1585 from LoopKit/testflight-healthusagest…

…ring

Add description keys for HK usage to watch extension

Bring in LoopKit updates for 2.2.6 patch

Bump rileylink_ios rev

Update rileylink_ios to use pinned carthage

Use embedded carthage binary

Update travis to use xcode12

Merge pull request LoopKit#1397 from LoopKit/dev

Release 2.2.4

Merge pull request LoopKit#1390 from LoopKit/dev

Release 2.2.3