This PR updates bump.php to replace all copyright years if needed.
Notice that even if someone merges a PR with files with wrong copyright date, on version bump with this improvement it will be automaticly corrected on version bump.
Testing Instructions
Change the current year in copyright date 2005 - 2016 in some files. For instance, put 2005 - 2012 instead.
Run php build/bump.php -v 3.6.0-beta2 (or current version, if other)
Check the copyright date in the files you changed before is 2005 - 2016 again.
I have tested this item✅ successfully on 2d0d846
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