Update CHANGELOG.md (#28221)

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Michael Thomsen 2016-12-30 12:11:15 +01:00 committed by GitHub
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### Language
* Breaking change: ['Generalized tear-offs'](https://github.com/gbracha/generalizedTearOffs/blob/master/proposal.md)
are no longer supported, and will cause errors. We updated the language spec
and added warnings in 1.21, and are now taking the last step to fully
de-support them. They were previously supported in the VM only.
* The `assert()` statement has been expanded to support an optional second
`message` argument (SDK issue [27342](https://github.com/dart-lang/sdk/issues/27342)).