rash_alt gem to resolve out-of-dependency

[shishi]

rash gem have out-of-dependency problems since Hashie had own Rash, I released rash-alt gem. This is just resolving rash's problems, I didn't change excpept that problems.

rash_alt accepted faraday_middleware, instead of original rash gem, to resolve out-of-dependency. If someone is in trouble as same situation, you can use rash_alt instead of original rash.

#9
https://rubygems.org/gems/rash_alt
lostisland/faraday_middleware#136