prepare for 2.3.0 release

Author: timmolter

README.md

@@ -224,7 +224,7 @@ Add the Sundial library as a dependency to your pom.xml file:
 <dependency>
     <groupId>org.knowm</groupId>
     <artifactId>sundial</artifactId>
-    <version>2.2.4</version>
+    <version>2.3.0</version>
 </dependency>
 ```
 
@@ -240,7 +240,7 @@ For snapshots, add the following to your pom.xml file:
 <dependency>
     <groupId>org.knowm</groupId>
     <artifactId>sundial</artifactId>
-    <version>2.2.5-SNAPSHOT</version>
+    <version>2.3.1-SNAPSHOT</version>
 </dependency>
 ```
 

pom.xml

@@ -4,7 +4,7 @@
 	<name>Sundial</name>
 	<groupId>org.knowm</groupId>
 	<artifactId>sundial</artifactId>
-	<version>2.2.4-SNAPSHOT</version>
+	<version>2.3.0-SNAPSHOT</version>
 	<packaging>bundle</packaging>
 	<description>A Lightweight Job Scheduling Framework forked from Quartz</description>
 	<url>http://knowm.org/open-source/sundial</url>