chore(deps): update dependency google/cloud-service-directory to ^0.3.0 (GoogleCloudPlatform#1171)

Author: renovate-bot

servicedirectory/composer.json

@@ -1,5 +1,5 @@
 {
     "require": {
-        "google/cloud-service-directory": "^0.2.0"
+        "google/cloud-service-directory": "^0.3.0"
     }
 }