Yf/reward fee precision

[yondonfu]

What does this pull request do? Explain your changes. (required)

Specific updates (required)

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Does this pull request close any open issues?

Checklist:

• [ ] README and other documentation updated
• [ ] All tests using npm run test pass

[coveralls]

Pull Request Test Coverage Report for Build 6edb9c86-f596-4230-b17c-21b09a5f828b

• 41 of 41 (100.0%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.003%) to 99.838%

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Totals
Change from base Build a6ff80cd-6169-4539-8d84-b96ce30e81c7:	0.003%
Covered Lines:	853
Relevant Lines:	853

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💛 - Coveralls