allow version 4 for nikic php-parser

[crevillo]

i'm playing with some other projects that requires this php-parser version.

do you think this could lead to some problems here? if so, please discard this.

[gggeek]

I would have to take a look at how we use it... The bundle iirc uses a small part of the php-parser api, and the release notes seem to be nicely detailed (https://github.com/nikic/PHP-Parser/blob/master/UPGRADE-4.0.md), so I'd say good chances of going in as soon as I can afford a few minutes to look into it

[codecov-io]

Codecov Report

Merging #167 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #167   +/-   ##
=========================================
  Coverage     67.51%   67.51%           
  Complexity     2293     2293           
=========================================
  Files           120      120           
  Lines          6055     6055           
=========================================
  Hits           4088     4088           
  Misses         1967     1967

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[gggeek]

Ok, the usage that we do of of php-parser is minimal. Going in