Update webpack config bundle size

[mradkov]

Quick fix was introduced #40 to bump the build size. But this should be dealt with at some point.

https://github.com/aeternity/jitsi-meet/pull/40#pullrequestreview-437400805

[shapkarin]

@mradkov we can reduce the bundle size with that approach https://www.npmjs.com/package/babel-plugin-lodash make the lodash imports transform from

import { times } from 'lodash' 

to the

import times from 'lodash/times'

[shapkarin]

Also we can use even the lodash-es