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

  Problem 1
    - Installation request for amphp/aerys ^0.4.3 -> satisfiable by amphp/aerys[v0.4.3].
    - amphp/aerys v0.4.3 requires nikic/fast-route ^0.8 -> no matching package found.

Potential causes:
 - A typo in the package name
 - The package is not available in a stable-enough version according to your minimum-stability setting
   see <https://getcomposer.org/doc/04-schema.md#minimum-stability> for more details.

Read <https://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.

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