Fix build script (as mentioned in https://github.com/StephenChou1017/react-big-scheduler/issues/56#issuecomment-455448991)

[bl5ck]

Learn more here (#56 (comment))
Please feel free to let me know if you need any adjustment/information.

[StephenChou1017]

@bl5ck
Hi, thanks for the PR. Is it used to resolve this issue(or else?):
After I merge your code, I can execute the npm run build without errors when adding ~ in src/less/antd-globals-hiding-hack.less file?

[bl5ck]

Actually you can but without adding ~. The error in my case is because I don't install execution binary globally. But that won't work with npm run example. It may need some adjustments though.

[bl5ck]

Let me know if you need that too. Then I would find another way to combine those fixes.

[StephenChou1017]

@bl5ck
What execution binary that you don't install globally causes the error in your case? I can't reappear your error using my latest repo at present, and I need to reappear it first.

[bl5ck]

Mines were babel and lessc.

[bl5ck]

Also please note that I use ubuntu 18.04

[hbatalhaStch]

hi @mathildamonni are you planning on resuming work on this repo