Switch to ^-mode dependency for "hamming"

[hawkrives]

Allows the package to pick up bug fixes and enhancements – it'll accept 0.0.2 and 0.0.3, or 1.0.1 and 1.1.1, but not 0.1.0, because semver is essentially moved over one slot for v0 versions.

[coveralls]

Pull Request Test Coverage Report for Build 5

• 0 of 0 (NaN%) changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 4:	0.0%
Covered Lines:	7
Relevant Lines:	7

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💛 - Coveralls

[hawkrives]

(For libraries, it's best practice to use the flexible version ranges, so that the consuming applications have some flexibility, whereas for apps – especially before the advent of lockfiles – it was best to use exact versions to restrict the variability. Now that we have lockfiles, there's much less of a reason to use fixed versions on apps, either.)