Version to 2.3.0 for release

Author: mbax

README.md

@@ -43,7 +43,7 @@ public class Example {
 <dependency>
     <groupId>org.kitteh.irc</groupId>
     <artifactId>client-lib</artifactId>
-    <version>2.2.0</version>
+    <version>2.3.0</version>
 </dependency>
 ```
 

docs/index.md

@@ -57,7 +57,7 @@ KICL is built and deployed using Maven. Releases are available on Maven Central.
 <dependency>
     <groupId>org.kitteh.irc</groupId>
     <artifactId>client-lib</artifactId>
-    <version>2.2.0</version>
+    <version>2.3.0</version>
     <scope>...</scope>
 </dependency>
 ```

pom.xml

@@ -4,7 +4,7 @@
 
     <groupId>org.kitteh.irc</groupId>
     <artifactId>client-lib</artifactId>
-    <version>2.3.0-SNAPSHOT</version>
+    <version>2.3.0</version>
 
     <packaging>jar</packaging>