Re-remove 5.2 from travis.yml
Re-remove 5.2 from travis.yml

There are a bunch of failing tests in the JsonView and HttpSocket
classes, both these failures are caused by annoying differences in PHP
that I don't think are really worth working around.

et304383/passbolt_api,et304383/passbolt_api,et304383/passbolt_api,et304383/passbolt_api,et304383/passbolt_api