Merge pull request #23 from johnnychen94/compat

restrict upper bound for dependency version compat

Author: johnnychen94

Project.toml

@@ -9,10 +9,10 @@ ImageCore = "a09fc81d-aa75-5fe9-8630-4744c3626534"
 ImageTransformations = "02fcd773-0e25-5acc-982a-7f6622650795"
 
 [compat]
-ColorTypes = ">= 0.3.2"
-Crayons = ">= 0.1.0"
-ImageCore = ">= 0.7"
-ImageTransformations = ">= 0.3.0"
+ColorTypes = "0.7, 0.8"
+Crayons = "0.5, 1, 2, 3, 4"
+ImageCore = "0.7, 0.8"
+ImageTransformations = "0.5, 0.6, 0.7, 0.8"
 julia = "1"
 
 [extras]