chore: Override `leche` package conflict

[congminh1254]

leche package is a package written by Box but it's deprecated for now. It have some conflict with mocha testing library, and specifying that not supporting the latest version of mocha, while still pass the unit tests.

This override remove the upper bound limit of mocha version which leche compatible.

[coveralls]

Pull Request Test Coverage Report for Build 5552819689

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 86.33%

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Totals
Change from base Build 5521173036:	0.0%
Covered Lines:	4116
Relevant Lines:	4616

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💛 - Coveralls