Add known issue about @aws-cdk/rtv

#151

CHANGELOG.md

@@ -14,6 +14,7 @@
    to define `region` when running `aws configure` ([#131])
  * `cdk docs` opens the index instead of the welcome page - __workaround__:
    click on "Welcome" in the sidebar ([#129])
+ * The runtime values library (__@aws-cdk/rtv__) is broken ([#151])
 
 [CloudFormation resource specification]: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/cfn-resource-specification.html
 [AWS Kinesis Data Streams]: https://aws.amazon.com/kinesis/data-streams
@@ -26,6 +27,10 @@
 [#128]: https://github.com/awslabs/aws-cdk/pull/128
 [#136]: https://github.com/awslabs/aws-cdk/pull/136
 [#119]: https://github.com/awslabs/aws-cdk/pull/119
+[#131]: https://github.com/awslabs/aws-cdk/pull/131
+[#138]: https://github.com/awslabs/aws-cdk/pull/138
+[#129]: https://github.com/awslabs/aws-cdk/pull/129
+[#151]: https://github.com/awslabs/aws-cdk/issues/151
 
 ## 0.7.1 - 2018-06-15