Fix create-statement for MySQL >5.6

modules/consent/docs/consent.md

@@ -72,8 +72,8 @@ database.
 Here is the initialization SQL script:
 
 	CREATE TABLE consent (
-		consent_date TIMESTAMP NOT NULL,
-		usage_date TIMESTAMP NOT NULL,
+		consent_date TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+		usage_date TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
 		hashed_user_id VARCHAR(80) NOT NULL,
 		service_id VARCHAR(255) NOT NULL,
 		attribute VARCHAR(80) NOT NULL,