readstring is deprecated in Julia 1.0 (#43)
readstring is deprecated in Julia 1.0 (#43)

`readstring` seems to be deprecated and moved to `read(io, String)` in Julia 1.0, according to the following issue.

https://github.com/JuliaLang/julia/issues/22793
ssfrr/SampleTypes.jl,JuliaAudio/SampleTypes.jl