revert import changes

Author: Lexer11l

slack-api-client/src/test/java/test_with_remote_apis/methods/canvases_Test.java

@@ -25,7 +25,8 @@
 import java.util.Collections;
 import java.util.List;
 
-import static org.hamcrest.CoreMatchers.*;
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.CoreMatchers.nullValue;
 import static org.hamcrest.MatcherAssert.assertThat;
 
 @Slf4j