Update composer phpunit comparability #10

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jmauerhan wants to merge 7 commits intophp-mock:masterfrom

GrovoLearning:master

Commits on Jun 9, 2016

update phpunit version
Jessica Mauerhan
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test on newer phpunit
Jessica Mauerhan
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build
Jessica Mauerhan
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fix version
Jessica Mauerhan
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Commits on Jun 10, 2016

remove 5.5
Jessica Mauerhan
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exclude incompatable versions
Jessica Mauerhan
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revert readme
Jessica Mauerhan
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