Optimize imports

Author: JanHolger

src/main/java/org/javawebstack/abstractdata/bson/BsonConverter.java

@@ -5,7 +5,6 @@
 import org.bson.types.ObjectId;
 import org.javawebstack.abstractdata.*;
 
-import java.nio.charset.StandardCharsets;
 import java.text.DateFormat;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;