fix imports

src/main/java/ru/ulstu/timeline/model/Event.java

@@ -4,7 +4,14 @@ import org.hibernate.validator.constraints.NotBlank;
 import ru.ulstu.core.model.BaseEntity;
 import ru.ulstu.user.model.User;
 
-import javax.persistence.*;
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.EnumType;
+import javax.persistence.Enumerated;
+import javax.persistence.FetchType;
+import javax.persistence.ManyToMany;
+import javax.persistence.Temporal;
+import javax.persistence.TemporalType;
 import java.util.Date;
 import java.util.List;