Update plugins

pom.xml

@@ -14,13 +14,6 @@
 	</description>
 	<url>http://github.com/ptomli/opensmpp</url>
 
-	<properties>
-		<core.version>2.4.0-SNAPSHOT</core.version>
-		<charset.version>2.4.0-SNAPSHOT</charset.version>
-		<client.version>2.4.0-SNAPSHOT</client.version>
-		<sim.version>2.4.0-SNAPSHOT</sim.version>
-	</properties>
-
 	<modules>
 		<module>core</module>
 		<module>charset</module>
@@ -172,7 +165,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
-				<version>2.5</version>
+				<version>3.0</version>
 				<configuration>
 					<source>1.6</source>
 					<target>1.6</target>
@@ -182,7 +175,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-source-plugin</artifactId>
-				<version>2.1.2</version>
+				<version>2.2.1</version>
 				<executions>
 					<execution>
 						<id>attach-sources</id>
@@ -195,7 +188,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-javadoc-plugin</artifactId>
-				<version>2.8.1</version>
+				<version>2.9</version>
 				<configuration>
 					<encoding>UTF-8</encoding>
 				</configuration>
@@ -211,11 +204,11 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-release-plugin</artifactId>
-				<version>2.3.1</version>
+				<version>2.4</version>
 				<configuration>
 					<preparationGoals>clean test</preparationGoals>
 				</configuration>
 			</plugin>
 		</plugins>
 	</build>
-</project>
+</project>