Warning when reading Matlab files in Julia 0.6.0

When I do the following in Julia 0.5.2 I have no warnings:

using MAT
file = matopen("file.mat") 
dict = read(file)

but when I change to Julia 0.6.0 I get the warning:

WARNING: Compat.ASCIIString is deprecated, use String instead.
  likely near In[1]:3 

I get the warning from read(file).
Shall I include Matlab files in some other way using Julia 0.6.0? Or is this just a warning I should ignore?

This is a deprecation warning, which you can ignore. Looks like it was fixed recently anyway, and should show up in the next release.

Thank you!