Update Maven plugins

pom.xml

@@ -343,7 +343,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
-				<version>3.1</version>
+				<version>3.2</version>
 				<configuration>
 					<source>1.7</source>
 					<target>1.7</target>
@@ -386,11 +386,6 @@
 					<locales>en</locales>
 				</configuration>
 			</plugin>
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-project-info-reports-plugin</artifactId>
-				<version>2.7</version>
-			</plugin>
 			<plugin>
 				<groupId>org.codehaus.mojo</groupId>
 				<artifactId>sonar-maven-plugin</artifactId>
@@ -426,7 +421,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-checkstyle-plugin</artifactId>
-				<version>2.12.1</version>
+				<version>2.13</version>
 				<configuration>
 					<configLocation>ARSnova-checkstyle-checker.xml</configLocation>
 				</configuration>
@@ -444,7 +439,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-war-plugin</artifactId>
-				<version>2.4</version>
+				<version>2.6</version>
 			</plugin>
 		</plugins>
 	</build>