支持 Laravel 7

[bolechen]

  Problem 1
    - yangyifan/upload v0.2 requires yangyifan/library-helper v0.1 -> satisfiable by yangyifan/library-helper[v0.1].
    - Installation request for yangyifan/upload v0.2 -> satisfiable by yangyifan/upload[v0.2].
    - Conclusion: remove monolog/monolog 2.0.2
    - Conclusion: don't install monolog/monolog 2.0.2
    - yangyifan/library-helper v0.1 requires monolog/monolog ^1.21 -> satisfiable by monolog/monolog[1.21.0, 1.22.0, 1.22.1, 1.23.0, 1.24.0, 1.25.0, 1.25.1, 1.25.2, 1.25.3, 1.x-dev].
    - Can only install one of: monolog/monolog[1.21.0, 2.0.2].
    - Can only install one of: monolog/monolog[1.22.0, 2.0.2].
    - Can only install one of: monolog/monolog[1.22.1, 2.0.2].
    - Can only install one of: monolog/monolog[1.23.0, 2.0.2].
    - Can only install one of: monolog/monolog[1.24.0, 2.0.2].
    - Can only install one of: monolog/monolog[1.25.0, 2.0.2].
    - Can only install one of: monolog/monolog[1.25.1, 2.0.2].
    - Can only install one of: monolog/monolog[1.25.2, 2.0.2].
    - Can only install one of: monolog/monolog[1.25.3, 2.0.2].
    - Can only install one of: monolog/monolog[1.x-dev, 2.0.2].
    - Installation request for monolog/monolog (locked at 2.0.2) -> satisfiable by monolog/monolog[2.0.2].

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