为什么我的fisher安装程序无法识别pyenv？

Question

我似乎无法使用fisher安装pyenv。

admin@admins-MacBook ~> fisher pyenv
error: unknown flag or command "pyenv"
usage: 
       fisher add <PACKAGES>    add packages
       fisher rm  <PACKAGES>    remove packages
       fisher                   update installed packages
       fisher ls                show installed packages
       fisher help              show this help
       fisher version           show version
       fisher self-update       update fisher
       fisher self-uninstall    uninstall fisher

examples:
       fisher add jethrokuan/z rafaelrinaldi/pure
       fisher add gitlab.com/owner/foobar@v2
       fisher add ~/path/to/myfish/pkg
       fisher rm rafaelrinaldi/pure
       fisher ls | fisher rm
       fisher add < bundle
admin@admins-MacBook ~>

Pyenv运行正常，我不知道为什么费舍尔无法运行pyenv命令。我正在使用以下安装指南：https://weknowinc.com/blog/running-multiple-python-versions-mac-osx