format and improve changelog

CHANGELOG.md

Index: CHANGELOG.md
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@@ -2,35 +2,41 @@
 
 ### Core library changes
 
- * Add `unmodifiable` constructor to `List` class - 
-   [r45334](https://code.google.com/p/dart/source/detail?r=45334),
-* Update experimental Isolate API:
-  - Make priorty parameters of `Isolate.ping` and `Isolate.kill` methods
+* `dart:core`
+  * Add `unmodifiable` constructor to `List` -
+    [r45334](https://code.google.com/p/dart/source/detail?r=45334)
+* `dart:isolate` *Experimental*
+  * Make the `priority` parameter of `Isolate.ping` and `Isolate.kill` methods
     a named parameter.
-  - Remove the `Isolate.AS_EVENT` priority.
-  - Add extra `response` parameter to `Isolate.ping` and
-    `Isolate.addOnExitListener`.
-  [r45092](https://code.google.com/p/dart/source/detail?r=45092),
+  * Remove the `Isolate.AS_EVENT` priority.
+  * Add extra `response` parameter to `Isolate.ping` and
+    `Isolate.addOnExitListener` -
+    [r45092](https://code.google.com/p/dart/source/detail?r=45092)
 
-## 1.10.0
+## 1.10.0 – 2015-04-29
 
 ### Core library changes
 
-* Fix behavior of `HtmlEscape` in `dart:convert`. It no longer escapes
-  no-break space (U+00A0) anywhere or forward slash ('/', U+002F) in element
-  context. Slash is still escaped in the "unknown" context.
+* `dart:convert`
+  * Fix behavior of `HtmlEscape`. It no longer escapes
+  no-break space (U+00A0) anywhere or forward slash (`/`, `U+002F`) in element
+  context. Slash is still escaped using `HtmlEscapeMode.UNKNOWN`.
   [r45003](https://code.google.com/p/dart/source/detail?r=45003),
   [r45153](https://code.google.com/p/dart/source/detail?r=45153),
   [r45189](https://code.google.com/p/dart/source/detail?r=45189)
 
-* dart:html: CssClassSet method arguments must now be 'tokens', i.e. non-empty
+* `dart:core`
+  * `Uri.parse` added `start` and `end` positional arguments.
+
+* `dart:html`
+  * `CssClassSet` method arguments must now be 'tokens', i.e. non-empty
   strings with no white-space characters. The implementation was incorrect for
   class names containing spaces. The fix is to forbid spaces and provide a
   faster implementation.
   [r44898](https://code.google.com/p/dart/source/detail?r=44898),
   [r45307](https://code.google.com/p/dart/source/detail?r=45307)
 
-## 1.9.3 (2015-04-14)
+## 1.9.3 – 2015-04-14
 
 This is a bug fix release which merges a number of commits from `bleeding_edge`.
 
@@ -55,7 +61,7 @@ This is a bug fix release which merges a number of commits from `bleeding_edge`.
   Pub can fail to load transformers necessary for local development -
   [r44876](https://code.google.com/p/dart/source/detail?r=44876)
 
-## 1.9.1 (2015-03-25)
+## 1.9.1 – 2015-03-25
 
 ### Language changes
 
@@ -169,7 +175,7 @@ documentation on the [Dart API site](http://api.dartlang.org).
   * Isolates spawned via `Isolate.spawn` now allow most objects, including
     top-level and static functions, to be sent between them.
 
-## 1.8.5 (2015-01-21)
+## 1.8.5 – 2015-01-21
 
 * Code generation for SIMD on ARM and ARM64 is fixed.
 
@@ -179,7 +185,7 @@ documentation on the [Dart API site](http://api.dartlang.org).
 
 [issue 21795]: https://code.google.com/p/dart/issues/detail?id=21795
 
-## 1.8.3 (2014-12-10)
+## 1.8.3 – 2014-12-10
 
 * Breakpoints can be set in the Editor using file suffixes ([issue 21280][]).
 
@@ -196,7 +202,7 @@ documentation on the [Dart API site](http://api.dartlang.org).
 [issue 21280]: https://code.google.com/p/dart/issues/detail?id=21280
 [issue 21698]: https://code.google.com/p/dart/issues/detail?id=21698
 
-## 1.8.0 (2014-11-28)
+## 1.8.0 – 2014-11-28
 
 * `dart:collection`: `SplayTree` added the `toSet` function.
 
@@ -237,7 +243,7 @@ documentation on the [Dart API site](http://api.dartlang.org).
 
 [alpn]: https://tools.ietf.org/html/rfc7301
 
-## 1.7.0 (2014-10-15)
+## 1.7.0 – 2014-10-15
 
 ### Tool changes