Your requirements could not be resolved to an installable set of packages.   
      Problem 1
        The requested package dingo/api could not be found in any version, there may be a typo in the package name.

    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://groups.google.com/d/topic/composer-dev/_g3ASeIFlrc/discussion> for more details.

照这个文档配置的 https://github.com/dingo/api/wiki/Installation