Issue #182: Don't autocheck for mech-dump so basic auth works

[simbabque]

Fixes #182

[coveralls]

Pull Request Test Coverage Report for Build 285

• 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 92.711%

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Totals
Change from base Build 284:	0.0%
Covered Lines:	725
Relevant Lines:	782

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💛 - Coveralls

[oalders]

Thanks @simbabque!