Update dependencies and make it compatible with PHP7 - #4

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machitgarha wants to merge 4 commits into

leedavis81:masterfrom

machitgarha:php7-compatibility

Commits on Jul 13, 2019

Update PHPUnit with dependencies
machitgarha
committed
cdf9e48
Update coveralls dependency
machitgarha
committed
7c94375
Move Null class to NullValue
machitgarha
committed
75f4b31
Fix .travis.yml
machitgarha
committed
0edc011