Update examples

[ThouCheese]

Updated the examples to run with tokio 1.0.

[Johannesd3]

Thanks!

I'm sorry I removed the Default impl of SessionConfig. It wasn't used in the binary, so I thought it was used nowhere, and it was the only reason why librespot-core depends on uuid. Should we add it back? Another option would be the builder pattern.

[ThouCheese]

I feel like the default impl is a more ergonomic, and that a builder pattern is not necessarily warranted for a struct with 4 fields.

[ThouCheese]

I also feel like the examples could be nicer without the let username = args[1].to_owned(); lines, so if we change the Credentials::with_password to take an impl Into<String>, those can go away.

[ThouCheese]

I reintroduced the old Default impl, be reintroducing the dependency on uuid.

[Johannesd3]

Looks good, but there are merge conflicts. You should rebase it (and maybe squash it into 1 or 2 commits while you're at it). And then I think it's ready.

[Johannesd3]

@ThouCheese Would you do this?

[ThouCheese]

Hi! Yes sorry that took so long, I had to fight a bit with git rebase (that is, learn how it works). Currently 1 commit and no conflicts.

[Johannesd3]

Great! Even better if you've learned something new.