Update RFC table in README

README.md

@@ -94,6 +94,7 @@ future state of the libraries and to discover projects for contribution.
 [85](/~https://github.com/aws/aws-cdk-rfcs/issues/85)|[Cross Account resource import and source account tracking](/~https://github.com/aws/aws-cdk-rfcs/issues/85)|[@skinny85](/~https://github.com/skinny85)|❓unknown
 [158](/~https://github.com/aws/aws-cdk-rfcs/issues/158)|[Experiment with Resource Provider in TypeScript](/~https://github.com/aws/aws-cdk-rfcs/pull/170)||❓unknown
 [162](/~https://github.com/aws/aws-cdk-rfcs/issues/162)|[Simplify working with logical IDs when refactoring CDK code](/~https://github.com/aws/aws-cdk-rfcs/issues/162)||❓unknown
+[217](/~https://github.com/aws/aws-cdk-rfcs/issues/217)|[Alternative infrastructure providers (other than CFN)](/~https://github.com/aws/aws-cdk-rfcs/issues/217)||❓unknown
 <!--END_TABLE-->
 
 ## What is an RFC?