Update dependencies

[nathanaelk]

Current version of AWSSDK.SecretsManager (3.3.0) requires AWSSDK.Core versions between 3.3.21.20 & 3.4.0. We had to downgrade a lot of AWSSDK.* packages to prevent incompatibility. Would it be possible to update the dependencies to the latest versions available. I tried and successfully an all the tests on them.
Will also be more than happy to help with maintaining the repo.

[Kralizek]

Hi @nathanaelk

Please check if the solution shown in the issue #40 helps your case.

[nathanaelk]

Hey @Kralizek ,
the solution from issue #40 works for me. Thank you for the prompt response and for making this package available for all of us

[Kralizek]

I'm glad it worked. Would you please give a look at the issue I just pinned (#45) and let me know if it's clear enough for others having the same issue in the future?

[nathanaelk]

Looked at #45 and it looks great. May be worth adding a reference to it in the README.
Thanks again.

[Kralizek]

Good idea, in the meantime I will close this issue :)