Update dependency mocha to v5.2.0 (dev)

This Merge Request updates dependency mocha from v5.1.1 to v5.2.0

Release Notes

v5.2.0

Compare Source

**🎉 Enhancements**

• #3375: Add support for comments in mocha.opts (@plroebuck)

**🐛 Fixes**

• #3346: Exit correctly from before hooks when using --bail (@outsideris)

**📖 Documentation**

• #3328: Mocha-flavored API docs! (@Munter)

**🔩 Other**

• #3330: Use Buffer.from() (@harrysarson)
• #3295: Remove redundant folder (@DavNej)
• #3356: Refactoring (@plroebuck)

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