test: Fixed Mocha deprecated warning

[edgardmessias]

Fixed the message: useColors is DEPRECATED and will be removed from a future version of Mocha. Instead, use the "color" option

Note: current Mocha is 6.0.2, but, the latest @types/mocha is 5.2.6

[codecov]

Codecov Report

Merging #520 into master will increase coverage by 0.53%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #520      +/-   ##
==========================================
+ Coverage   56.25%   56.78%   +0.53%     
==========================================
  Files          98       98              
  Lines        3943     3943              
  Branches      571      571              
==========================================
+ Hits         2218     2239      +21     
+ Misses       1514     1492      -22     
- Partials      211      212       +1

Impacted Files	Coverage Δ
src/repository.ts	60.86% <0%> (-0.22%)	⬇️
src/commands/command.ts	51.53% <0%> (+0.51%)	⬆️
src/historyView/repoLogProvider.ts	27.75% <0%> (+0.88%)	⬆️
src/historyView/itemLogProvider.ts	41.48% <0%> (+2.12%)	⬆️
src/extension.ts	73.11% <0%> (+2.15%)	⬆️
src/svnContentProvider.ts	55.88% <0%> (+2.94%)	⬆️
src/model.ts	65.23% <0%> (+4.72%)	⬆️
src/contexts/checkActiveEditor.ts	92.85% <0%> (+7.14%)	⬆️

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[JohnstonCode]

🎉 This PR is included in version 1.47.6 🎉

The release is available on GitHub release

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