Other TTL format support

[m-terlinde]

Hey guys,

thanks for your really cool package!
I found an issue today: the library expects the TTL only in an integer format (like $TTL 12345) but doesn't expect a still valid TTL like $TTL 1d.

Do you mind supporting these as well?

[kantai]

Hey m-terlinde --

We'd happily review a PR for supporting these kinds of TTLs.

[m-terlinde]

Hey kantai,

ah I see ;).
If I've got some spare time, I'll do it.