[WIP] Update high-level-api.jl - Don't merge

[s-celles]

Closes #23
Closes #24

[s-celles]

However

I wonder if it won't be more consistant to have readuntil:

• returning a String if delim is a String
• returning a Vector{Char} if delim is a Vector{Char}
• returning a Vector{UInt8} if delim is a Vector{UInt8}

what is your opinion @andrewadare ?

[s-celles]

Something like

out = typeof(delim)()

or

out = Vector{T}()

and

push!(out, c)

instead of

write(out, c)

and

return out

instead of

return String(take!(out))

[samuelpowell]

I assume this is now stale and can be closed, but feel free to reopen if not.