Fix POM for java 11 support

Issue-ID: DMAAP-1585
Signed-off-by: sliard <samuel.liard@gmail.com>
Change-Id: Iefe6fedfd22c2932236ca2c61c56f99a86b90bb3
diff --git a/pom.xml b/pom.xml
index 2be51ac..62fc85f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -252,6 +252,14 @@
                 </dependencies>
             </plugin>
             <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>11</source>
+                    <target>11</target>
+                </configuration>
+            </plugin>
+            <plugin>
                 <artifactId>maven-assembly-plugin</artifactId>
                 <version>2.4</version>
                 <configuration>