Closh requires node version 9, but your version is v12.18.3

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When I try to install closh via `npm install closh` I get this error:

```
ERROR: Closh requires node version 9, but your version is v12.18.3.

Please switch to the required node version and install closh again.

To switch node versions you can use nvm, learn more at https://github.com/creationix/nvm

Once you have nvm you can install the proper node version with:

$ nvm install v9 && nvm use v9

npm WARN notsup Unsupported engine for closh@0.5.0: wanted: {"node":"9.x"} (current: {"node":"12.18.3","npm":"6.14.6"})
npm WARN notsup Not compatible with your version of node/npm: closh@0.5.0
npm WARN enoent ENOENT: no such file or directory, open '/home/akond/package.json'
npm WARN akond No description
npm WARN akond No repository field.
npm WARN akond No README data
npm WARN akond No license field.
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@2.1.3 (node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@2.1.3: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})
```

Reproduce the npm install failure with Node v12.18.3 and inspect the package metadata and installation entry points that enforce the Node 9 requirement. Determine the intended supported Node versions and verify that installation completes on the supported version range.

Written by the indexing model from the issue text.