Make "eqc_ex" dependency only available in test

[qcam]

Since QuickCheck is only used in "test" environment, would you consider restricting eqc_ex in the environment only?

[coveralls]

Pull Request Test Coverage Report for Build 3

• 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 87.85%

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Totals
Change from base Build 29:	0.0%
Covered Lines:	564
Relevant Lines:	642

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💛 - Coveralls

[gausby]

Thanks! I've upgraded the setup on the semaphore ci system.