demoseasygood first issue
説明
Eg:
```julia:extable
#hideall
using PrettyTables
io = IOBuffer()
pretty_table(io, [1 5.0; 2 4.0], ["degree" "bound"], backend=:html);
println("~~~", String(take!(io)), "~~~")
```
\textoutput{extable}
This can make for a nice demo (maybe better if the demo also discusses input from CSV directly).