upgrade to faraday 2.0

[yegor256]

Currently, the gem depends on faraday_middleware, which depends on faraday ~>1.0. Because of this, it's impossible to use this gem with faraday ~>2.0. Is it possible somehow to get rid of the faraday_middleware dependency?

[yegor256]

@greyblake maybe you can help?

[greyblake]

@yegor256 Would you open a PR?
It looks like faraday_middleware is not used anywhere (at least explicitly).
Can you try to remove it?

[yegor256]

@greyblake take a look: #5