Bump phpunit/phpunit from 5.4.8 to 5.6.3

[dependabot[bot]]

Bumps phpunit/phpunit from 5.4.8 to 5.6.3.

Commits

• a9de0db Prepare release
• 9556142 Merge branch '5.5' into 5.6
• 52ddda8 Merge branch '5.4' into 5.5
• 2d3d18e Merge branch '5.3' into 5.4
• 0deafa7 Merge branch '5.2' into 5.3
• 601bc8a Merge branch '5.1' into 5.2
• 815c54b Merge branch '5.0' into 5.1
• bca6e20 Merge branch '4.8' into 5.0
• 558a3a0 Prepare release
• 03bf7e0 Update ChangeLog
• Additional commits viewable in compare view

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