Use :async to company-phpactor, Version 2

[zonuexe]

refs #129

This PR was based on #129 and made function calls asynchronous using async package. (Thanks @nanasess)

[nanasess]

@zonuexe It worked so well! Thanks 👍

[kermorgant]

This one leaves me doubtful. Why remove composer.lock and why do it here ?

[kermorgant]

Hi @zonuexe @nanasess
good to see this work, thanks :-)
Not sure I can provide any insight about the code but I will try it tomorrow.

[kermorgant]

just tested, seems to work well.

On code level, I will trust you as I'm not used to async and a bit short of time to dive into it :-)

Only thing that worries me is that line with composer.lock being removed : as far as I understand, its purpose is to get identical installations of dependencies for everyone, and that sounds to me as a good thing, so what's the reason to remove it ?

[zonuexe]

composer.lock is essentially unnecessary if composer.json is properly described. There is a trouble caused by this file being present. However, since it was found that simply erasing would cause another problem for existing users, we will deal with it again in another PR.