Fix assume_role handling when role_arn is given#185

mikalinnanoja-rovio wants to merge 1 commit intocloudposse:maincloudposse/terraform-aws-tfstate-backend:mainfrom

mikalinnanoja-rovio:feature_assume_role_block_syntaxmikalinnanoja-rovio/terraform-aws-tfstate-backend:feature_assume_role_block_syntaxCopy head branch name to clipboard