Add Toby Hodges as one of the lesson authors

[anenadic]

Invite @tobyhodges to add himself to the list of authors after his contribution in PR #201.

[tobyhodges]

Thanks @anenadic I'm happy to have contributed but I will keep myself off the list for this one. Looking forward to making more contributions in the future, at which point I reserve the right to change my mind ☺️