fix(deps): update dependency boxen to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
boxen	dependencies	major	^3.0.0 -> ^4.0.0	source

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Release Notes

sindresorhus/boxen

v4.0.0

Compare Source

Breaking:

• Require Node.js 8 2e99867
• Rename box style single-double to singleDouble
• Rename box style double-single to doubleSingle

Breaking for TypeScript users:

• Only use a CommonJS export for the TypeScript definition
  - You need to change import boxen from 'boxen'; to import boxen = require('boxen');

Enhancements:

• Add bold box style
• Upgrade dependencies 2e99867

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[codecov]

Codecov Report

Merging #22 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #22   +/-   ##
======================================
  Coverage    99.7%   99.7%           
======================================
  Files          14      14           
  Lines         340     340           
======================================
  Hits          339     339           
  Misses          1       1

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