v2.20.0

[ychescale9]

• Support non-mobile targets: android-wear, android-wear-cn, android-tv and google-tv. - #180 @alexvanyo.
• Update SDK command-line tools to 5.0. - #174
• Update build tools to 31.0.0. - #174
• Add option to specify the channel to download SDK components from: stable (default), beta, dev and canary. - #185

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This discussion was created from the release v2.20.0.