Move token out of the repo

[daviddias]

#52 (comment)

From @lgierth

Move the token file to something like $HOME/.protocol/dnsimple.token -- just so it's never underneath the repo directory and there's no chance of ever accidentally committing it.

You can just assume that people put it there out-of-band (dnslink.sh will fail on its own).

[daviddias]

done with #54, thanks @richsilv //cc @lgierth :)