changed target to java 1.8

pom.xml

@@ -16,7 +16,7 @@
 				<artifactId>maven-compiler-plugin</artifactId>
 				<version>3.8.1</version>
 				<configuration>
-					<release>11</release>
+					<release>8</release>
 				</configuration>
 			</plugin>
 			<plugin>