Update spectre_client
Update spectre_client

Failing gemspec validation for the dependency `spectre_client` prevented installation of this package. `spectre_client` was fixed in https://github.com/wearefriday/spectre_client/pull/8 but `spectre` still needs to be updated to use it.
wearefriday/spectre,wearefriday/spectre,wearefriday/spectre,wearefriday/spectre