postinstall breaks the installation of 0.17.2

[mikeroll]

Describe the bug

0.17.2 and I think #149 specifically broke the package installation for me:

❯ node --version && npm --version           
v15.8.0
7.5.4

❯ npm install @asyncapi/[email protected]
npm ERR! code 127
npm ERR! path /Users/mike/work/owhealth-server/node_modules/@asyncapi/html-template
npm ERR! command failed
npm ERR! command sh -c rimraf "template/css/main.min.css" && npm run generate:atomcss && npm run generate:maincss && npm run generate:tailwind.css
npm ERR! > @asyncapi/[email protected] generate:atomcss
npm ERR! > cross-env NODE_ENV=production postcss template/css/atom-one-dark.min.css -o template/css/main.min.css
npm ERR! sh: cross-env: command not found
npm ERR! npm ERR! code 127
npm ERR! npm ERR! path /Users/mike/work/owhealth-server/node_modules/@asyncapi/html-template
npm ERR! npm ERR! command failed
npm ERR! npm ERR! command sh -c cross-env NODE_ENV=production postcss template/css/atom-one-dark.min.css -o template/css/main.min.css
npm ERR! 
npm ERR! npm ERR! A complete log of this run can be found in:
npm ERR! npm ERR!     /Users/mike/.cache/npm/_logs/2021-02-16T10_54_23_393Z-debug.log

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/mike/.cache/npm/_logs/2021-02-16T10_54_23_918Z-debug.log

Which is fair, I don't seem to have this cross-env. I'm not too familiar with npm, but it seems that this is because postinstall depends on a tool from devDependencies, which are not installed during a normal npm install.

How to Reproduce

Just try installing.

❯ npm install @asyncapi/[email protected]

Expected behavior

The package should install fine.

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[mikeroll]

Dupe of #151, they beat me to it :)

[derberg]

This is how you learn you have users 😭
sorry folks, PR opened already