add v0.5

Author: Gaika

README.md

@@ -9,7 +9,7 @@
 
 Install ArrayFire library: either [download a binary](http://arrayfire.com/download) from the official site, or you can [build from source](https://github.com/arrayfire/arrayfire).
 
-In Julia v0.6:
+In Julia v0.5 and v0.6:
 ```julia
 Pkg.add("ArrayFire")
 Pkg.checkout("ArrayFire")