Fix warnings during gem build
Fix warnings during gem build

> WARNING:  open-ended dependency on simplecov (>= 0, development) is not recommended
>  if simplecov is semantically versioned, use:
>    add_development_dependency 'simplecov', '~> 0'
> WARNING:  pessimistic dependency on webmock (~> 1.18.0, development) may be overly strict
>  if webmock is semantically versioned, use:
>    add_development_dependency 'webmock', '~> 1.18', '>= 1.18.0'

webionate/pactas_itero