Relicensing to MIT

See https://github.com/racket/racket/issues/1570. I would like to relicense gotop to the more permissive MIT license and doing so would require having any past and future contributors relicense their changes under the MIT license. The AGPLv3 license was originally chosen due to the drawille-go dependency and also the smc.c and smc.h files for macOS temperatures, both of which are GPL and which we would also need to migrate off of.

If you have contributed commits to gotop and are willing to relicense your commits under MIT, please comment on this issue with the following:

I, <name>, license past and future contributions to gotop under the MIT license.

Thanks!

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edit: updated the relicensing wording for clarity.