avn setup is not working properly with node >10

[ctaepper]

Please describe your issue clearly and also include all details below.

Details

• avn 0.2.3
• node 10.5.0
• nvm 0.33.11
• zsh 5.5.1

nvm specific

• [x] As an nvm user I am confirming that I did not install with Homebrew

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npm install -g avn avn-nvm installs both packages properly in the global node_modules folder

but when running avn setup, the script does not copy the plugins (in this case avn-nvm) into the plugins folder at ~/.avn/plugins.

when running the same steps with node 8, everything is working as expected