Bump pyyaml from 3.13 to 5.1 in /src/recommendationservice (#317)
Bump pyyaml from 3.13 to 5.1 in /src/recommendationservice (#317)


GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/microservices-demo