CompatHelper: bump compat for Images to 0.26, (keep existing compat)

Author: CompatHelper Julia

Project.toml

@@ -10,7 +10,7 @@ Optim = "429524aa-4258-5aef-a3af-852621145aeb"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [compat]
-Images = "0.24, 0.25"
+Images = "0.24, 0.25, 0.26"
 OffsetArrays = "1"
 Optim = "1"
 Statistics = "1"