meetup: remove unused import

exercises/meetup/src/test/java/MeetupTest.java

@@ -4,8 +4,7 @@ import org.junit.Test;
 import java.time.DayOfWeek;
 import java.time.LocalDate;
 
-import static org.hamcrest.CoreMatchers.*;
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertEquals;
 
 public class MeetupTest {