clean imports

src/main/java/org/heigit/ohsome/clustertools/CreateH2Extract.java

@@ -6,11 +6,9 @@ import com.beust.jcommander.ParameterException;
 import it.unimi.dsi.fastutil.io.FastByteArrayInputStream;
 import it.unimi.dsi.fastutil.io.FastByteArrayOutputStream;
 import java.io.File;
-import java.io.FileReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.ObjectOutputStream;
-import java.io.Reader;
 import java.sql.Connection;
 import java.sql.DriverManager;
 import java.sql.PreparedStatement;
@@ -27,7 +25,6 @@ import java.util.Set;
 import java.util.TreeMap;
 import java.util.stream.Collectors;
 import java.util.stream.StreamSupport;
-import javax.cache.Cache;
 import org.apache.ignite.IgniteCache;
 import org.apache.ignite.cache.query.QueryCursor;
 import org.apache.ignite.cache.query.ScanQuery;