Allow GPUArrays v3.1.0. (#45)

* Remove type requirement from CircularArrayBuffer.

* Allow GPUArrays v3.1.0.

* Also allow CuArrays v2.0, v2.1.

Author: aterenin

Project.toml

@@ -20,12 +20,12 @@ Zygote = "e88e6eb3-aa80-5325-afca-941959d7151f"
 
 [compat]
 Adapt = "1"
-CUDAapi = "3, 4.0"
-CuArrays = "1.7"
+CUDAapi = "3, 4"
+CuArrays = "1.7, 2"
 Distributions = "0.22, 0.23"
 FillArrays = "0.8"
 Flux = "0.10"
-GPUArrays = "2, 3.0"
+GPUArrays = "2, 3"
 MacroTools = "0.5"
 ProgressMeter = "1.2"
 ReinforcementLearningBase = "0.6"