[chore] Use marked v4

[icecream17]

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Description of the Change

Copied from https://github.com/icecream17/github/pull/2

Actually updating to v4.0.10 The only relevant breaking change: https://github.com/markedjs/marked/releases/tag/v4.0.0 is that the default export is removed: ({marked} = require('marked'))

Parens are required to make it not a SyntaxError.

Only other change is that the docs: https://marked.js.org/using_advanced recommend using sanitize on the output instead of in the options

The tests should pass (except for the ones that failed in https://github.com/atom/github/pull/2724): https://github.com/icecream17/github/pull/2

Although I don't know why there's more coverage

Screenshot or Gif

Applicable Issues

[codecov[bot]]

Codecov Report

Merging #2731 (02e6dda) into dependabot/npm_and_yarn/marked-4.0.10 (b5629b6) will increase coverage by 0.04%. The diff coverage is 100.00%.

@@                            Coverage Diff                            @@
##           dependabot/npm_and_yarn/marked-4.0.10    #2731      +/-   ##
=========================================================================
+ Coverage                                  93.43%   93.47%   +0.04%     
=========================================================================
  Files                                        237      237              
  Lines                                      13213    13212       -1     
  Branches                                    1900     1900              
=========================================================================
+ Hits                                       12345    12350       +5     
+ Misses                                       868      862       -6     

Impacted Files	Coverage Δ
lib/helpers.js	89.25% <100.00%> (+0.36%)	:arrow_up:
lib/git-shell-out-strategy.js	100.00% <0.00%> (+0.18%)	:arrow_up:
lib/controllers/reviews-controller.js	100.00% <0.00%> (+1.75%)	:arrow_up:
lib/views/github-dotcom-markdown.js	100.00% <0.00%> (+1.85%)	:arrow_up:
lib/atom/gutter.js	92.85% <0.00%> (+2.38%)	:arrow_up:

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