use __DIR__ instead of __FILE__

src/utils.jl

@@ -8,7 +8,7 @@ about the effects of the applied augmentation operations. It is
 thus well suited to prototype an augmentation pipeline, because it
 makes it easy to see what kind of effects one can achieve with it.
 """
-testpattern() = load(joinpath(dirname(@__FILE__()), "..", "resources", "testpattern.png"))
+testpattern() = load(joinpath(@__DIR__, "..", "resources", "testpattern.png"))
 
 function use_testpattern()
     info("No custom image specifed. Using \"testpattern()\" for demonstration.")