Add randomly generated user agents

[muppet3000]

Added an alternative solution to #40

[muppet3000]

Note - Once we agree on an implementation I'd like to update the documentation before it's merged, there's no point me doing that before the decision is made though

[indykoning]

It's looking good to me! We can still request without problems using this? 🙂

[muppet3000]

It's looking good to me! We can still request without problems using this? 🙂

😄 Yeah it still works!
I've emailed every possible support address I can find for Growatt asking them to collaborate with us, so I'm hoping they come back eventually!

[muppet3000]

I've now added the documentation & an example with all the options and it even validates that it works.

I've changed the logic slightly so that it matches the way the server_url is stored, it also means that you can access the default value if you want to extend it and pass it back in (see my examples).

[indykoning]

Looks good! I'll merge this as 1.3.0 🎉