Merge pull request nock#1238 from nock/greenkeeper/debug-4.1.0

update debug to version 4.1.0

test: skip failing test (nock#1222)

docs: Add a section on becoming a Maintainer

This section should represent ways to help out as a contributor, and what we look for in maintainers. I tried to highlight the main things that community members can do to help out, and what the maintainers look for when we are thinking about having someone join the project. What do you think?

Merge pull request nock#1177 from timrogers/master

feat: Allow optionally() to be called with a value, specifying if the mock should be optional

test: new SSL certificates for local testing (nock#1181)

We use self-signed SSL certificates in our tests to check that
Nock works okay with HTTPS.

Unfortunately, these certificates expired on 2nd August 2018,
making tests fail.

This issues new ones, valid for 10 years from today (i.e.
until 31st July 2028) and adds to `tests/ssl/index.js` the
commands you need to run if you want to regenerate the needed
files.

fix(nock#1076): allowUnmocked: true + host regex (nock#1179)

fix(nock#1171): When matching the path by function, also check the HT…

…TP method.

fix: Replaced util._extend with Object.assign due to deprecated since…

… node v6.

docs: Add CONTRIBUTE, edit README, update LICENSE year (nock#1155)

feat: emit 'request' event with body as third parameter (nock#1062)