Fixed typo in link in CHANGELOG

CHANGELOG.md

 ## 1.13.0
 
 * `dart:core`
   * `Uri` added `removeFragment` method.
 
 * `dart:io`
   * `HttpClient` no longer sends URI fragments in the requeust. This is not
     allowed by the HTTP protocol.
     The `HttpServer` still gracefully receives fragments, but discards them
     before delivering the request.
@@ skipping 170 matching lines @@
   * `Isolate.spawnUri` added a named argument `checked`.
   * Remove the experimental state of the API.
 
 * `dart:profiler` - **DEPRECATED**
   * This library will be removed in 1.12. Use `dart:developer` instead.
 
 ### Tool changes
 
 * This is the first release that does not include the Eclipse-based
   **Dart Editor**.
-  See [dartlang.org/tools](https://www.dartlang.org/tools/]) for alternatives.
+  See [dartlang.org/tools](https://www.dartlang.org/tools/) for alternatives.
 * This is the last release that ships the (unsupported)
   dart2dart (aka `dart2js --output-type=dart`) utility as part
   of dart2js
 
 ## 1.10.0 – 2015-04-29
 
 ### Core library changes
 
 * `dart:convert`
   * **POTENTIALLY BREAKING** Fix behavior of `HtmlEscape`. It no longer escapes
@@ skipping 262 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.