fix(dev-server): remove hotOnly

[hiroppy]

DON'T MERGE

Remove hotONly, see webpack/webpack-dev-server#2546

• Read and sign the CLA. PRs that haven't signed it won't be accepted.
• Make sure your PR complies with the writer's guide.
• Review the diff carefully as sometimes this can reveal issues.
• Do not abandon your Pull Request: Stale Pull Requests.
• Remove these instructions from your PR as they are for your eyes only.

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[jeffin143]

I guess we should remove DON'T MERGE since the pr is merged

[montogeek]

It could be merged but no released.

[EugeneHlushko]

@hiroppy when is this planned to be released?

[hiroppy]

@EugeneHlushko We plan to release webpack-dev-server@4 next week but not established. However, we have only one remaining task so I think it can. Anyway, I'm going to submit many PRs for v4 so please review! (but don't merge them<3

[EugeneHlushko]

@hiroppy did this get released yet? been a while

[hiroppy]

@EugeneHlushko not yet. see webpack/webpack-dev-server#2592

[jeffin143]

This could be merged now

[hiroppy]

hm, I don't think so because the webpack-dev-server is beta currently.

[montogeek]

Do we still need this?
Friendly ping @hiroppy

[snitin315]

Closing in favor of :

• docs(configuration): webpack-dev-server v4 #4950