Sqlite_orm: Bug with toupper() function

[nuttapongCodium]

On line 135 in sqlite_orm.h, toupper() is used but the correct toupper() isn't included as a header and therefore requires 2 arguments instead of the only 1 provided. This can be fixed by including #include <cctype>.

[fnc12]

It was fixed but wasn't released. Please use dev branch until new release is out

[heilkn]

Good day, I also ran into this problem. Please do not wait so long and merge this trivial fix back to your release branch as soon as possible. Else, your released version cannot be used at all.

[fnc12]

@heilkn please checkout dev branch where everything works fine. Release 1.3 will be published in a month