chore: bump webpack and webpack-cli dependencies

[macabeus]

It is necessary to fix the error Cannot read property 'properties' of undefined

https://github.com/plotly/dash-component-boilerplate/issues/12#issuecomment-425040481

[NullVoxPopuli]

I just ran in to this error myself

[NullVoxPopuli]

On this branch, I got an error with babel-core

$ yarn && yarn build
yarn install v1.17.3
warning package-lock.json found. Your project contains lock files generated by tools other than Yarn. It is advised not to mix package managers in order to avoid resolution inconsistencies caused by unsynchronized lock files. To clear this warning, remove package-lock.json.
[1/4] Resolving packages...
[2/4] Fetching packages...
info [email protected]: The platform "linux" is incompatible with this module.
info "[email protected]" is an optional dependency and failed compatibility check. Excluding it from installation.
[3/4] Linking dependencies...
warning " > [email protected]" has unmet peer dependency "babel-core@6".
[4/4] Building fresh packages...
success Saved lockfile.
$ npm run build
npm WARN lifecycle The node binary used for scripts is /tmp/yarn--1569420475859-0.4898397621835602/node but npm is using /home/psego/.volta/tools/image/node/10.16.3/6.9.0/bin/node itself. Use the `--scripts-prepend-node-path` option to include the path for the node binary npm was executed with.

> [email protected] build /home/psego/Development/OpenSource/lint-diff
> webpack

Hash: 3c7d06c3693317dfe717
Version: webpack 4.30.0
Time: 63ms
Built at: 09/25/2019 10:07:56 AM
           Asset      Size  Chunks             Chunk Names
    lint-diff.js  6.62 KiB    main  [emitted]  main
lint-diff.js.map  3.52 KiB    main  [emitted]  main
Entrypoint main = lint-diff.js lint-diff.js.map
[./index.js] 2.84 KiB {main} [not cacheable] [built] [failed] [1 error]

ERROR in ./index.js
Module build failed (from ../node_modules/babel-loader/lib/index.js):
Error: Cannot find module 'babel-core'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15)
    at Function.Module._load (internal/modules/cjs/loader.js:562:25)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (/home/psego/Development/OpenSource/lint-diff/node_modules/v8-compile-cache/v8-compile-cache.js:161:20)
    at Object.<anonymous> (/home/psego/Development/OpenSource/lint-diff/node_modules/babel-loader/lib/index.js:3:13)
    at Module._compile (/home/psego/Development/OpenSource/lint-diff/node_modules/v8-compile-cache/v8-compile-cache.js:194:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (/home/psego/Development/OpenSource/lint-diff/node_modules/v8-compile-cache/v8-compile-cache.js:161:20)
    at loadLoader (/home/psego/Development/OpenSource/lint-diff/node_modules/loader-runner/lib/loadLoader.js:18:17)
    at iteratePitchingLoaders (/home/psego/Development/OpenSource/lint-diff/node_modules/loader-runner/lib/LoaderRunner.js:169:2)
    at runLoaders (/home/psego/Development/OpenSource/lint-diff/node_modules/loader-runner/li