Support skipping a specific version of an api.
Support skipping a specific version of an api.

dougbeal/google-api-swift-client-for-rest,google/google-api-objectivec-client-for-rest,dougbeal/google-api-swift-client-for-rest,dougbeal/google-api-swift-client-for-rest,dougbeal/google-api-swift-client-for-rest,google/google-api-objectivec-client-for-rest,google/google-api-objectivec-client-for-rest,google/google-api-objectivec-client-for-rest,google/google-api-objectivec-client-for-rest