Added support for AWS profiles

[apokryfos]

Added support for AWS profiles (as per https://docs.aws.amazon.com/sdk-for-php/v3/developer-guide/guide_credentials_profiles.html)

[developernaren]

@apokryfos when I add the profile key, it is not logging things, are there any external setups that I need to do to test this?

[apokryfos]

This should work if you have a ~/.aws/credentials file with the profile you specified in it (the syntax is shown in https://docs.aws.amazon.com/sdk-for-php/v3/developer-guide/guide_credentials_profiles.html) but this will probably not work in combination with providing the credentials directly.