Fix imports

Author: nitinjavakid

modules/swagger-core/src/main/java/io/swagger/v3/core/jackson/ModelResolver.java

@@ -65,7 +65,17 @@
 import java.lang.annotation.Annotation;
 import java.lang.reflect.Type;
 import java.math.BigDecimal;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;