Extend res.links() to allow adding multiple links with the same rel #2729

[andvea]

This pr fixes #2729

I've done the following:

• [x] Added a new test that covers my changes
• [x] Runned linter

[andvea]

Hi @dougwilson, seems like there is a problem with the Node.js 6.x ci test in the master branch, which runs with [email protected]. This problem doesn't occur in 4.18 branch, which has the Node.js 6.x ci test with [email protected]. Should I do something? Maybe should I close this PR and open the same for the 4.18 branch? Let me know 😊

[dougwilson]

Hi @andvea no need to do anything. We'll get it fixed up as it get close to landing. Sorry for any confusion there. An issue like that which is not caused by your PR can typically be ignored as it won't be held against your PR or anything :)

[andvea]

Great, wish you good work!