Merge pull request #3574 from matsim-org/kt86-update-pom

Update deprecated expression in pom of decongestion contrib

Author: kt86

contribs/decongestion/pom.xml

@@ -8,7 +8,7 @@
 		<dependency>
 			<groupId>org.matsim.contrib</groupId>
 			<artifactId>otfvis</artifactId>
-			<version>${parent.version}</version>
+			<version>${project.parent.version}</version>
 			<scope>test</scope>
 		</dependency>
 	</dependencies>