Updated app.yaml.
Updated app.yaml.

GoogleCloudPlatform/PerfKitExplorer,GoogleCloudPlatform/PerfKitExplorer,dq922/PerfKitExplorer,dq922/PerfKitExplorer,dq922/PerfKitExplorer,GoogleCloudPlatform/PerfKitExplorer,dq922/PerfKitExplorer,GoogleCloudPlatform/PerfKitExplorer