CompatHelper: bump compat for "DataStructures" to "0.18" (#181)

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Project.toml

@@ -24,11 +24,11 @@ TiledIteration = "06e1c1a7-607b-532d-9fad-de7d9aa2abac"
 CatIndices = "0.2"
 ColorVectorSpace = "0.6, 0.7, 0.8"
 ComputationalResources = "0.3"
-DataStructures = "0.17.7"
+DataStructures = "0.17.7, 0.18"
 FFTViews = "0.3"
 FFTW = "0.3, 1"
 ImageCore = "0.8.1"
-ImageMetadata = "0.9"  # it doesn't actually depend on ImageMetadata, but if present we want arraydata to work
+ImageMetadata = "0.9"
 MappedArrays = "0.2"
 OffsetArrays = "1.1"
 Requires = "0.5, 1.0"