update psych dependancy from v0.7.2 to v0.9.6

[digitall-it]

• Problem: sliver cannot be installed
• Procedure: composer global require littlegiant/sliver
• Expected result: installation complete
• Obtained result: Error message
• Environment: Mac OSX High Sierra, PHP v7.1.17 via HomeBrew
• Suggested operation: Update composer.json dependancies for psy/psysh to ^0.9.6
• Log:

composer global require littlegiant/sliver
Changed current directory to ~/.composer
Using version ^0.1.0 for littlegiant/sliver
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Can only install one of: psy/psysh[v0.7.2, v0.9.6].
    - Can only install one of: psy/psysh[v0.9.6, v0.7.2].
    - Can only install one of: psy/psysh[v0.7.2, v0.9.6].
    - littlegiant/sliver 0.1.0 requires psy/psysh ^0.7.2 -> satisfiable by psy/psysh[v0.7.2].
    - Installation request for littlegiant/sliver ^0.1.0 -> satisfiable by littlegiant/sliver[0.1.0].
    - Installation request for psy/psysh (locked at v0.9.6, required as @stable) -> satisfiable by psy/psysh[v0.9.6].


Installation failed, reverting ./composer.json to its original content.

[stevie-mayhew]

Hi @digitall-it

Thanks for the report! Would you be able to open a PR with the fix for us?

Cheers,
Stevie

[digitall-it]

Tried to test the configuration, but that not worked well, so didn't PR. Seems like if try to install 0.9.6 then a Symfony library gets installed that has some functions not supported by PHP 7.1, like function args with ?int(I think they are type hints that work in PHP 7.2). However, as my environment with the database was residing inside a vagrant machine anyway, I remembered to try again there, where PHP 7.0 is installed, and the software installed correctly.