Updates Maven compiler to Java 11

Signed-off-by: Jannis Jung <jannis.jung@iese.fraunhofer.de>

Author: jannisjung

pom.xml

@@ -62,13 +62,13 @@
 		<testSourceDirectory>src/test/java</testSourceDirectory>
 
 		<plugins>
-			<!-- Compile Sources using Java 8 -->
+			<!-- Compile Sources using Java 11 -->
 			<plugin>
 				<artifactId>maven-compiler-plugin</artifactId>
 				<version>3.8.1</version>
 				<configuration>
-					<source>1.8</source>
-					<target>1.8</target>
+					<source>11</source>
+					<target>11</target>
 				</configuration>
 			</plugin>