build and use java11

pom.xml

@@ -3,7 +3,15 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>org.matsim.contrib</groupId>
 	<artifactId>matsim-gtfs</artifactId>
-	<version>12.1-SNAPSHOT</version>
+	<version>13.0-SNAPSHOT</version>
+
+	<properties>
+		<matsim.version>12.0</matsim.version>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+		<maven.compiler.source>11</maven.compiler.source>
+		<maven.compiler.target>11</maven.compiler.target>
+	</properties>
 
 	<repositories>
 		<repository>
@@ -36,23 +44,11 @@
 		</repository>
 	</repositories>
 
-	<build>
-		<plugins>
-			<plugin>
-				<artifactId>maven-compiler-plugin</artifactId>
-				<version>3.1</version>
-				<configuration>
-					<source>1.8</source>
-					<target>1.8</target>
-				</configuration>
-			</plugin>
-		</plugins>
-	</build>
 	<dependencies>
 		<dependency>
 			<groupId>org.matsim</groupId>
 			<artifactId>matsim</artifactId>
-			<version>12.0</version>
+			<version>${matsim.version}</version>
 		</dependency>
 		<dependency>
 			<groupId>com.conveyal</groupId>