Bump to 0.2.3
diff --git a/Cargo.toml b/Cargo.toml
index ef99a07..0af2d65 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 
 name = "petgraph"
-version = "0.2.2"
+version = "0.2.3"
 license = "MIT/Apache-2.0"
 authors = [
 "bluss",
diff --git a/README.rst b/README.rst
index e6fab8d..94d308a 100644
--- a/README.rst
+++ b/README.rst
@@ -2,7 +2,7 @@
 petgraph
 ========
 
-Graph data structure library.
+Graph data structure library. Requires Rust 1.6.
 
 Please read the `API documentation here`__
 
@@ -19,6 +19,11 @@
 Recent Changes
 --------------
 
+- 0.2.3
+
+  - Require Rust 1.6: Due to changes in how rust uses type parameter defaults.
+  - Implement Graph::clone_from.
+
 - 0.2.2
 
   - Require Rust 1.5