Prepare version

Author: Gianmarco Garrisi

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "priority-queue"
-version = "2.2.2"
+version = "2.3.0"
 authors = ["Gianmarco Garrisi <[email protected]>"]
 description = "A Priority Queue implemented as a heap with a function to efficiently change the priority of an item."
 repository = "https://github.com/garro95/priority-queue"

README.md

@@ -132,6 +132,7 @@ All contribution shall be under a license compatible with the GNU LGPL version 3
 
 ## Changes
 
+* 2.3.0 Implement retain and retain_mut
 * 2.2.2 Fix a bug in the heapify_up implementation for DoublePriorityQueue
 * 2.2.1 Fix docs.rs build
 * 2.2.0 Implement `pop_if`. Documentation Improvements