Add spec helper (RequestMiddlewareExampleGroup)
Add spec for IIJ::Sakagura::Core::Middleware::SignatureV2
Merge pull request #1 from himura/feature/add-middleware-test

Middleware::SignatureV2 用のテスト追加
Faraday.register_middleware have been removed.
Restrict dependency on both faraday and faraday_middleware version to >= 0.8.0 && < 0.10.
Merge pull request #3 from himura/support-faraday0-9

faraday 0.9 対応
Update vcr dependencies
Remove deprecated RSpec setting
Wipe deprecated rspec syntax
Version bump