Update instruction for loading dotenv

[ahangarha]

Loading dotenv in production raise error for the obvious reason that we install it only for development and test environment. So I think this instruction should be included in the readme file so that we load it only if we are in the desired environments.

[domcermak]

This sounds like your personal use case. It is common to use dotenv files across environments. So why change the instructions also for other devs?

[bkeepers]

Thanks for the pull request, @ahangarha. Since people can copy and paste the example and modify it to suit their needs, I think this is fine.

[ahangarha]

This sounds like your personal use case. It is common to use dotenv files across environments. So why change the instructions also for other devs?

I kind of agree with you. I think we need more robust documentation about this matter. I tried to put a comment above the line to indicate the reason we have that condition. So if someone is copy/pasting and doesn't have deeper knowledge, things go fine. Otherwise it is still easy to customize it as per the user's need.

So while I don't consider my PR as the best possible option, but I think it is one small step ahead.

Thanks for developing and maintaining this project.