Update FeatureProbeDemo.java

Author: gangb-tech

src/main/java/com/featureprobe/sdk/example/FeatureProbeDemo.java

@@ -8,7 +8,6 @@
 import java.util.concurrent.TimeUnit;
 
 import com.featureprobe.sdk.server.Loggers;
-import groovy.util.logging.Slf4j;
 import org.slf4j.LoggerFactory;
 import ch.qos.logback.classic.Level;
 import ch.qos.logback.classic.Logger;