CompatHelper: bump compat for CUDA to 4, (keep existing compat)

Author: CompatHelper Julia

Project.toml

@@ -21,7 +21,7 @@ Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"
 Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 
 [compat]
-CUDA = "1, 2.0, 3.0"
+CUDA = "1, 2.0, 3.0, 4"
 Distributions = "0.23, 0.24, 0.25"
 FileIO = "1.4"
 Flux = "0.10, 0.11, 0.12, 0.13"