Add: package.json: postinstall

[sotayamashita]

I added npm-scripts, post-install to run AFTER the package is installed.

ref:

• https://docs.npmjs.com/misc/scripts

[gaearon]

What does this solve? I'm not sure I understand the intention.

[sotayamashita]

@gaearon When developer contribute this project, I think it help them start developing. For example, if you there is not postinstall:

git clone ~ 
npm i
npm run build
npm start

However, if there is postinstall,

git clone ~
npm i
npm start

[gaearon]

You don't need to run build before start. They are completely independent.

[gaearon]

Closing since this doesn’t appear to be necessary.