implementation: Require generation in the multi-keyring #170
Description
Followup to #157
- C Require generation in the multi-keyring aws/aws-encryption-sdk-c#557
- Javascript Require generation in the multi-keyring aws/aws-encryption-sdk-javascript#382
- Java Require generation in the multi-keyring aws/aws-encryption-sdk-java#201
- Python Require generation in the multi-keyring aws/aws-encryption-sdk-python#278