Merge pull request #49 from SixLabors/js/avif-lfs

Update .gitattributes to add HEIF LFS support

Author: JimBobSquarePants

.gitattributes

@@ -136,3 +136,6 @@
 *.ico               filter=lfs diff=lfs merge=lfs -text
 *.cur               filter=lfs diff=lfs merge=lfs -text
 *.ani               filter=lfs diff=lfs merge=lfs -text
+*.heic              filter=lfs diff=lfs merge=lfs -text
+*.hif               filter=lfs diff=lfs merge=lfs -text
+*.avif              filter=lfs diff=lfs merge=lfs -text