Supporting AWS profiles (AWS_PROFILE=)

[ebarault]

Hi,

Although the code already handles the default credentials provider chain:
https://github.com/trustpilot/kafka-connect-dynamodb/blob/master/source/src/main/java/com/trustpilot/connector/dynamodb/aws/AwsClients.java#L46, this does not works when using a local profile, but fails with the following error message:

To use assume role profiles the aws-java-sdk-sts module must be on the class path.

In order to fix this, the following line should be added in the build.gradle:

compile group: 'com.amazonaws', name: 'aws-java-sdk-sts', version: '1.11.846'

[ebarault]

thank-you @raimondast i'll test this