Issue ota4j-team#21: Reformat with spotlessApply

Author: mmichaelis

src/test/java/org/opentest4j/debug/serializer/RenderedImageSerializerTests.java

@@ -25,9 +25,9 @@
 
 import org.junit.Before;
 import org.junit.Test;
-import org.opentest4j.TestSerializationHelper;
 import org.opentest4j.TestFixtures.SomeNonSerializable;
 import org.opentest4j.TestFixtures.SomeSerializable;
+import org.opentest4j.TestSerializationHelper;
 
 /**
  * Tests {@link RenderedImageSerializer}.