manage author list in AUTHORS instead package.json

[outsideris]

Currently, the contributor list managed in package.json. However, it is too long.
So, we moved the list into AUTHORS

• update-authors.js updated to fit mocha.(original update-authors.js comes from Node's scripts)
• AUTHORS made based on v6.2.1. It's latest list.
• TJ is added into AUTHORS, he was excluded before because the old list is a contributor list
• Old list has 474 emails and new list has 468. Because there was some duplicated people. So, it is same list.
  • ahmadbamieh@gmail.com -> L25 and L62
  • info@staypositive.ru -> L133 and L136
  • gaye@mozilla.com -> L171 and L175
  • k.hokamura@gmail.com -> L192 and L268
  • outsideris@gmail.com -> L347 and L226
  • plroebuck@users.noreply.github.com -> L349 and L356
  • ScottFreeCode@users.noreply.github.com -> L401 and L402

close #4053

[coveralls]

Coverage increased (+0.07%) to 92.925% when pulling bf1cd2d on outsideris:extract-authors into d0f04e9 on mochajs:master.

[juergba]

As per boneskull's comment

ensure the AUTHORS file is written to at publish time

above part is missing.

[outsideris]

I updated to run update-authors.js when run npm start version.

[outsideris]

I also updated maintainer's guide for releasing.

[outsideris]

Anyway, I rebased this onto master and updated AUTHORS.

[juergba]

@outsideris thank you, lgtm.