back to CUDA v4

Author: navidcy

Project.toml

@@ -20,7 +20,7 @@ Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 
 [compat]
-CUDA = "1, 2.4.2, 3.0.0 - 3.6.4, 3.7.1, 4, 5"
+CUDA = "1, 2.4.2, 3.0.0 - 3.6.4, 3.7.1, 4"
 DocStringExtensions = "0.8, 0.9"
 FFTW = "1"
 Interpolations = "0.12, 0.13, 0.14"