removed dependency to google charste (in test class)

src/test/java/it/unibz/inf/isochrone/network/AlgorithmRuntimeTest.java

 package it.unibz.inf.isochrone.network;
 
-import com.google.common.base.Charsets;
-
 import it.unibz.inf.isochrone.algorithm.Isochrone;
 import it.unibz.inf.isochrone.algorithm.MDijkstra;
 import it.unibz.inf.isochrone.algorithm.MineX;
@@ -41,7 +39,7 @@ import org.testng.annotations.Test;
 public final class AlgorithmRuntimeTest {
 	private static final Logger LOGGER = LoggerFactory.getLogger(AlgorithmRuntimeTest.class);
 	private static final int REPEAT_COUNT = 5;
-	private static final String RESULTFILE_ENCODING = Charsets.UTF_8.toString();
+	private static final String RESULTFILE_ENCODING = "UTF-8";
 	private static final String RESULTFILE_CSV_RUNTIME = "build/reports/tests/algorithm-runtimes.csv";
 	private static final String RESULTFILE_XML_RUNTIME = "build/reports/tests/algorithm-runtimes.xml";
 	private static final Direction DIRECTION = Direction.INCOMING;