Add linear solution for day2 - no division.

[dalmirdasilva]

Hey, I appreciate your solutions in golang.

Here a small contribution.

The solution populates the product from 0 up to the ith. Then, on a second round, it computes the product from len - 1 to the ith element and and multiplies to the product previously calculated.

Thanks,

[coveralls]

Pull Request Test Coverage Report for Build 1789

• 21 of 21 (100.0%) changed or added relevant lines in 2 files are covered.
• 8 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.06%) to 99.77%

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Files with Coverage Reduction	New Missed Lines	%
day255/problem.go	2	94.29%
day329/problem.go	6	86.96%
<!--	Total:	8		-->

Totals
Change from base Build 1787:	-0.06%
Covered Lines:	12603
Relevant Lines:	12632

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💛 - Coveralls