Fix #325, fmt.Errorf call has more than one error-wrapping directive %w

[coveralls]

Pull Request Test Coverage Report for Build 5710746189

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.03%) to 62.212%

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Files with Coverage Reduction	New Missed Lines	%
modules/binary.go	2	73.91%
<!--	Total:	2		-->

Totals
Change from base Build 5658434483:	-0.03%
Covered Lines:	4781
Relevant Lines:	7685

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💛 - Coveralls