Updated composer.json to mitigate abandonment of react/socket-client

[wgroenewold]

Updated react/http version in composer.json to mitigate abandonment error.

[jclg]

There is a dependency problem:

Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for semako/phpws 1.0.1 -> satisfiable by semako/phpws[1.0.1].
    - react/http v0.8.4 requires react/stream ^1.0 || ^0.7.1 -> satisfiable by react/stream[v0.7.1, v0.7.2, v0.7.3, v0.7.4, v0.7.5, v0.7.6, v0.7.7, v1.0.0, v1.1.0].
    - Can only install one of: react/stream[v0.7.1, v0.4.6].
    - Can only install one of: react/stream[v0.7.2, v0.4.6].
    - Can only install one of: react/stream[v0.7.3, v0.4.6].
    - Can only install one of: react/stream[v0.7.4, v0.4.6].
    - Can only install one of: react/stream[v0.7.5, v0.4.6].
    - Can only install one of: react/stream[v0.7.6, v0.4.6].
    - Can only install one of: react/stream[v0.7.7, v0.4.6].
    - Can only install one of: react/stream[v1.0.0, v0.4.6].
    - Can only install one of: react/stream[v1.1.0, v0.4.6].
    - semako/phpws 1.0.1 requires react/stream 0.4.6 -> satisfiable by react/stream[v0.4.6].
    - Installation request for react/http ^0.8.4 -> satisfiable by react/http[v0.8.4].

semako/phpws needs react/stream: 0.4.6 (https://packagist.org/packages/semako/phpws).
Maybe we should use mpociot/phpws instead (https://packagist.org/packages/mpociot/phpws).