Write TOML to file

[slycelote]

It would be handy to have a way to serialize an existing Table.

[cies]

Did you really miss this feature? I never ran into it. But then it is good to see the lib being used beyond the initial scope :)

It should be a fairly simple task, I'd create some ToString and/or ToText class in the same fashion of ToJSON and ToBsJSON.

Would you like to make a PR for that?