Allow Mocha 5 as peerDependency

[astorije]

I have been using Mocha 5 + mocha-webpack 1.0.1 successfully on thelounge/thelounge#1726, so I think support for it can be endorsed.

This effectively suppresses the following warning at install time:

npm WARN [email protected] requires a peer of mocha@^2.4.5 || ^3.0.0 || ^4.0.0 but none was installed.

[codecov-io]

Codecov Report

Merging #204 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #204   +/-   ##
=======================================
  Coverage   96.77%   96.77%           
=======================================
  Files          28       28           
  Lines         744      744           
=======================================
  Hits          720      720           
  Misses         24       24

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[astorije]

@zinserjan, would you be able to look at this PR, and make a release if you're okay with it?
At the moment, mocha-webpack + Mocha v5 + Node.js v4 (still LTS for a few months) breaks npm install 😢
(More accurately, npm that comes with Node.js v4 and not directly Node.js v4, but the outcome is the same)

[astorije]

The failure on Travis is due to a missing peer dependencies with Node v4. I would ignore this because Node v4 is dropped by supporting Webpack v4. It can also be resolved by upgrading bdd-lazy-var, but I don't want to introduce too many unrelated changes in this PR. Happy to bump bdd-lazy-var in another PR though. EDIT: Nevermiiiind, npm is unhappy so bumping it.

[zinserjan]

Thanks, will publish this asap!