Clean code

Author: vitalijr2

src/test/java/uk/bot_by/aws_lambda/slf4j/AWSLambdaServiceProviderTest.java

@@ -2,7 +2,6 @@
 
 import static org.junit.jupiter.api.Assertions.assertAll;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
-import static org.junit.jupiter.api.Assertions.assertNull;
 
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Tag;