UTF8String -> String deprecations

[sje30]

Hi,
is the Autoreload.jl package still the thing to use in Julia 0.5 onwards to overcome the problem of redefining types within a repl session? I've just dug up some old code where I used areload() in 2015, and it seems to work. I did however get various deprecations:

using Autoreload
WARNING: Base.UTF8String is deprecated, use String instead.
  likely near /home/sje30/.julia/v0.5/Autoreload/src/constants.jl:1
WARNING: Base.UTF8String is deprecated, use String instead.
  likely near /home/sje30/.julia/v0.5/Autoreload/src/constants.jl:1
WARNING: Base.UTF8String is deprecated, use String instead.
  likely near /home/sje30/.julia/v0.5/Autoreload/src/constants.jl:7
WARNING: Base.UTF8String is deprecated, use String instead.
  likely near /home/sje30/.julia/v0.5/Autoreload/src/constants.jl:7
WARNING: Base.UTF8String is deprecated, use String instead.
  likely near /home/sje30/.julia/v0.5/Autoreload/src/constants.jl:12

I'm happy to submit a PR sometime if required.

thanks!