Update XmlWriter.java

Author: pjfanning

src/main/java/com/fasterxml/jackson/dataformat/xml/XmlWriter.java

@@ -4,7 +4,6 @@
 import com.fasterxml.jackson.core.exc.StreamWriteException;
 import com.fasterxml.jackson.core.io.CharacterEscapes;
 import com.fasterxml.jackson.core.io.DataOutputAsStream;
-import com.fasterxml.jackson.core.io.SegmentedStringWriter;
 import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.core.util.ByteArrayBuilder;
 import com.fasterxml.jackson.databind.DatabindException;