adds README note about isntalling OpenCL drivers

ssfrr · ssfrr · commit 3e574d02efe2 · 2018-01-28T11:39:50.000-05:00
diff --git a/README.md b/README.md
@@ -24,3 +24,5 @@ end
 # you can also filter with is_gpu, is_cpu
 gpu_devices = CLArrays.devices(is_gpu)
 ```
+
+Note that CLArrays.jl does not handle installing OpenCL drivers for your machine. You will need to make sure you have the appropriate drivers installed for your hardware.
