devel/phpunit6: Update to 6.1.4

[joneum]

Summary

-Update to 6.1.6

• Changes: https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-6.1.md

Approved by: xxx (mentor)
#Differential Revision: https://reviews.freebsd.org/Dxxxxx

Test Plan

devel/phpunit6 % portlint -AC
WARN: Makefile: for new port, make $FreeBSD$ tag in comment section empty, to make SVN happy.
0 fatal errors and 1 warning found.

Update tested in VirtualBox with FreeBSD 11.0 -p8 and PHP 7.0

Poudriere works with PHP 56 and cannot installed this Port (doesn't support PHP 5.6)

[tz]

Use "Changelog" instead of "Changes" for commit-log and everything is fine.