Incrementing to 2.4.0.

This is due to the non-breaking API changes
in 505226f8ad

ProtocolLib/pom.xml

@@ -2,7 +2,7 @@
   <modelVersion>4.0.0</modelVersion>
   <groupId>com.comphenix.protocol</groupId>
   <artifactId>ProtocolLib</artifactId>
-  <version>2.3.1-SNAPSHOT</version>
+  <version>2.4.0</version>
   <packaging>jar</packaging>
   <description>Provides read/write access to the Minecraft protocol.</description>
   

ProtocolLib/src/main/resources/plugin.yml

@@ -1,5 +1,5 @@
 name: ProtocolLib
-version: 2.3.1-SNAPSHOT
+version: 2.4.0
 description: Provides read/write access to the Minecraft protocol.
 author: Comphenix
 website: http://www.comphenix.net/ProtocolLib