Remove updating elements only in development environment

[MagnusPoppe]

Removes unwanted bugs that only occur in production environments for anyone who hasn't read through the source code.

[smalluban]

Hi @MagnusPoppe!

Thank you for the time you took to prepare this PR. However, this part of the code is required for the Hot Module Replacement feature, which is very useful. It works in development mode, which can be turned on only by the bundlers (browser environment does not provide process.env.NODE_ENV, and library fallbacks then to "production" value).

Can you provide a use case, where it might be confusing, and leads to bugs in the production environment? If it is a probable situation it might be worth mentioning how that feature works in the docs, so other people would not be confused.

I have no intention to remove that feature. By the way, you forgot to remove the update() function in the source code (so, there is unused leftover 😄).

[smalluban]

@MagnusPoppe I'm closing PR now due to no recent activity here. Use my comment above if you want to proceed with any changes. The best way is to start with an issue if you found obstacles with the HMR implementation.