Adjust parentheses after << method name.

[wtn]

While using Ruby 3.3.9, I saw the following warning:

% bundle exec rake test
…/protocol-http-0.53.0/lib/protocol/http/header/accept.rb:84:
warning: parentheses after method name is interpreted as an argument list, not a decomposed argument

Types of Changes

• Maintenance.

Contribution

• I tested my changes locally.
• I agree to the Developer's Certificate of Origin 1.1.

[ioquatix]

In other parts of the code we use def << value. Is that also problematic?

[wtn]

I think it's only this specific style that's problematic:

def << (arg)

So I've removed the parentheses from both definitions of #<< that had them, now it's consistent throughout.

[ioquatix]

Thanks!