Update SquareApiException.java

Author: fern-support

src/main/java/com/squareup/square/core/SquareApiException.java

@@ -13,6 +13,7 @@
 import java.util.Map;
 import java.util.HashMap;
 import java.util.Optional;
+import okhttp3.Response;
 
 /**
  * This exception type will be thrown for any non-2XX API responses.