Update GPUToolbox compat (#560)

Author: christiangnrd

Project.toml

@@ -38,7 +38,7 @@ CodecBzip2 = "0.8.5"
 ExprTools = "0.1"
 GPUArrays = "11.2.1"
 GPUCompiler = "0.26, 0.27, 1"
-GPUToolbox = "0.1"
+GPUToolbox = "0.1, 0.2"
 KernelAbstractions = "0.9.1"
 LLVM = "7.2, 8, 9"
 LLVMDowngrader_jll = "0.6"