Actually release the performance changes to path.

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//790173004
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 59f3893..1cc7127 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.3.1
+
+* Add a number of performance improvements.
+
 ## 1.3.0
 
 * Expose a top-level `context` field that provides access to a `Context` object
diff --git a/pubspec.yaml b/pubspec.yaml
index c4c6ff2..c9f0ec6 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: path
-version: 1.3.0
+version: 1.3.1
 author: Dart Team <misc@dartlang.org>
 description: >
  A string-based path manipulation library. All of the path operations you know