fmt: remove refs to deprecated io/ioutil

[testwill]

PR Introduction

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[jamesread]

@testwill Hey, thanks so much for your first contribution to OliveTin! I'm really curious, what made you go find this issue, and fix it? Were you working on something else you'd like help with?

Your changes look absolutely fine - I had no idea that ioutil was deprecated, and I love getting rid of additional dependencies. Many thanks.

I'll run the tests and merge as long as they succeed (unlikely to have any issues).

[testwill]

@testwill Hey, thanks so much for your first contribution to OliveTin! I'm really curious, what made you go find this issue, and fix it? Were you working on something else you'd like help with?

Your changes look absolutely fine - I had no idea that ioutil was deprecated, and I love getting rid of additional dependencies. Many thanks.

I'll run the tests and merge as long as they succeed (unlikely to have any issues).

staticcheck

[jamesread]

@testwill Nice, I just tried staticcheck and that gives me a few new things to look at.

What made you decide to run staticcheck against OliveTin? Just re-running tests after the force-push.