update changelog for 1.9.3 release and date

CHANGELOG.md

-## 1.9.2 (2015-04)
+## 1.9.3 (2015-04-14)
 
 This is a bug fix release which merges a number of commits from `bleeding_edge`.
 
 * dart2js: Addresses as issue with minified Javascript output with CSP enabled -
   [r44453](https://code.google.com/p/dart/source/detail?r=44453)
 
-* Editor: Fixes accidental updating of files in the pub cache during rename 
+* Editor: Fixes accidental updating of files in the pub cache during rename
   refactoring - [r44677](https://code.google.com/p/dart/source/detail?r=44677)
 
-* Editor: Resolves 
+* Editor: Fix for
   [issue 23032](https://code.google.com/p/dart/issues/detail?id=23032)
   regarding skipped breakpoints on Windows -
   [r44824](https://code.google.com/p/dart/source/detail?r=44824)
 
-* Fix MethodMirror.source when the method is on the first line in a script -
+* dart:mirrors: Fix `MethodMirror.source` when the method is on the first line
+  in a script -
   [r44957](https://code.google.com/p/dart/source/detail?r=44957),
   [r44976](https://code.google.com/p/dart/source/detail?r=44976)
 
-
-* Resolves [issue 23084](https://code.google.com/p/dart/issues/detail?id=23084):
+* pub: Fix for
+  [issue 23084](https://code.google.com/p/dart/issues/detail?id=23084):
   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)
 
 ### Language changes
 
 * Support for `async`, `await`, `sync*`, `async*`, `yield`, `yield*`, and `await
   for`. See the [the language tour][async] for more details.
 
@@ skipping 63 matching lines @@
   * Support for locking files to prevent concurrent modification was added. This
     includes the `File.lock`, `File.lockSync`, `File.unlock`, and
     `File.unlockSync` functions as well as the `FileLock` class.
 
   * Support for starting detached processes by passing the named `mode` argument
     (a `ProcessStartMode`) to `Process.start`. A process can be fully attached,
     fully detached, or detached except for its standard IO streams.
 
   * `HttpServer.bind` and `HttpServer.bindSecure` added the `v6Only` named
     argument. If this is true, only IPv6 connections will be accepted.
-    
+
   * `HttpServer.bind`, `HttpServer.bindSecure`, `ServerSocket.bind`,
     `RawServerSocket.bind`, `SecureServerSocket.bind` and
     `RawSecureServerSocket.bind` added the `shared` named argument. If this is
     true, multiple servers or sockets in the same Dart process may bind to the
     same address, and incoming requests will automatically be distributed
     between them.
 
   * **Deprecation:** the experimental `ServerSocketReference` and
     `RawServerSocketReference` classes, as well as getters that returned them,
     are marked as deprecated. The `shared` named argument should be used
@@ skipping 113 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.