Start working on version 1.24 of the Dart SDK

CHANGELOG.md

+## 1.24.0
+
+### Language
+
+### Core library changes
+
+### Dart VM
+
+### Strong Mode
+
+### Tool Changes
+
 ## 1.23.0
 
 ### Language
 * Allow using URI strings in `part of` declarations to refer to the
   importing library.
   A library part now can declare its library either as:
   `part of name.of.library;` or as `part of "uriReferenceOfLibrary.dart";`.
   This allows libraries with no library declarations (and therefore no name)
   to have parts, and it allows tools to easily find the library of a part file.
 
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 * dartfmt
   * Support new generic function typedef syntax.
   * Make the precedence of cascades more visible.
   * Fix a couple of places where spurious newlines were inserted.
   * Correctly report unchanged formatting when reading from stdin.
   * Ensure space between `-` and `--`. Code that does this is pathological, but
     it technically meant dartfmt could change the semantics of the code.
   * Preserve a blank line between enum cases.
   * Other small formatting tweaks.
 
-## 1.22.0
+## 1.22.0 - 2017-02-14
 
 ### 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 only supported in the VM, and there
     are almost no known uses of them in the wild.
 
@@ skipping 1653 matching lines @@
     they will keep the Dart process alive until they time out. This fixes the
     handling of persistent connections. Previously, the client would shut down
     immediately after a request.
 
   * **Breaking change:** `HttpServer` no longer compresses all traffic by
     default. The new `autoCompress` property can be set to `true` to re-enable
     compression.
 
 * `dart:isolate`: `Isolate.spawnUri` added the optional `packageRoot` argument,
   which controls how it resolves `package:` URIs.