Hotfix: set correct permission on cache file

tempnam creates file with 0600 permission and it can cause issue
on some environments when different user is generating the cache file
and then different user try to get access to it.

Resolve #90

Pull Request #91:

478 of 527 relevant lines covered (90.7%)

5.13 hits per line

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ID	Job ID	Ran	Files	Coverage
8	260.8 (DEPS=locked CS_CHECK=true TEST_COVERAGE=true)	21 Oct 2019 12:54PM UTC	0	90.7	Travis Job 260.8

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Travis Build #260
Pull Request #91

URL: https://coveralls.io/builds/26438490

⇱ zendframework/zend-modulemanager | Build #260 | Coveralls - Test Coverage History & Statistics

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URL: https://coveralls.io/builds/26438490

⇱ zendframework/zend-modulemanager | Build #260 | Coveralls - Test Coverage History & Statistics

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