Update Image.h

src/Image.h

@@ -19,6 +19,12 @@
 #include <gif_lib.h>
 #endif
 
+#if GIFLIB_MAJOR > 5 || GIFLIB_MAJOR == 5 && GIFLIB_MINOR >= 1
+  #define GIF_CLOSE_FILE(gif) DGifCloseFile(gif, NULL)
+#else
+  #define GIF_CLOSE_FILE(gif) DGifCloseFile(gif)
+#endif
+
 class Image: public node::ObjectWrap {
   public:
     char *filename;