Update README about "Supported version"
Checking in changes prior to tagging version "0.2.4".

Changelog diff:

diff --git a/History.md b/History.md
index 0d985ce..4f9950a 100644
--- a/History.md
+++ b/History.md
@@ -1,5 +1,11 @@
 # Revision history for murmurhash3

+0.2.4 / 2014-04-23
+==================
+
+  * Add dependency: NAN (Native Abstractions for Node.js)
+  * Update document
+
 0.2.3 / 2013-07-03
 ==================