chore: minor lint fix

Author: minherz

src/test/java/com/google/cloud/logging/logback/LoggingAppenderTest.java

@@ -27,7 +27,6 @@
 import ch.qos.logback.classic.filter.ThresholdFilter;
 import ch.qos.logback.classic.spi.ILoggingEvent;
 import ch.qos.logback.classic.spi.LoggingEvent;
-import com.google.common.base.Strings;
 import com.google.cloud.MonitoredResource;
 import com.google.cloud.Timestamp;
 import com.google.cloud.logging.LogEntry;
@@ -36,6 +35,7 @@
 import com.google.cloud.logging.LoggingEnhancer;
 import com.google.cloud.logging.Payload;
 import com.google.cloud.logging.Severity;
+import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import java.io.ByteArrayOutputStream;