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Copy changes to CHANGELOG.md from stable to bleeding-edge.

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Review URL: https://codereview.chromium.org/1454293002 .
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William Hesse 2015-11-18 16:45:21 -08:00
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@ -18,7 +18,7 @@
* `Platform` added an `isiOS` getter and `Platform.operatingSystem` may now
return `ios`.
## 1.13.0
## 1.13.0 - 2015-11-18
### Core library changes
* `dart:async`
@ -141,10 +141,14 @@
### Language changes
* Null-aware operators
* `??`: if null operator. `expr1 ?? expr2` evaluates to `expr1` if not `null`, otherwise `expr2`.
* `??=`: null-aware assignment. `v ??= expr` causes `v` to be assigned `expr` only if `v` is `null`.
* `x?.p`: null-aware access. `x?.p` evaluates to `x.p` if `x` is not `null`, otherwise evaluates to `null`.
* `x?.m()`: null-aware method invocation. `x?.m()` invokes `m` only if `x` is not `null`.
* `??`: if null operator. `expr1 ?? expr2` evaluates to `expr1` if
not `null`, otherwise `expr2`.
* `??=`: null-aware assignment. `v ??= expr` causes `v` to be assigned
`expr` only if `v` is `null`.
* `x?.p`: null-aware access. `x?.p` evaluates to `x.p` if `x` is not
`null`, otherwise evaluates to `null`.
* `x?.m()`: null-aware method invocation. `x?.m()` invokes `m` only
if `x` is not `null`.
### Core library changes