Fix deprecation about RSpec color mode
Fix deprecation about RSpec color mode

I'm seeing this warning:

    RSpec::Core::Configuration#color_enabled= is deprecated. Use
    RSpec::Core::Configuration#color= instead. Called from
    devise-capturable/spec/spec_helper.rb:12:in `block in <top (required)>'.

Update the configuration setting to use the new "color" attr name in
spec_helper.

oreillymedia/devise-capturable,oreillymedia/devise-capturable