Update library express-oauth-server to 4.0.0

Author: jingqi-ao

server2server/provider/model.js

@@ -16,9 +16,9 @@ function createModel (db) {
  }
 
  if (typeof scope === 'string') {
- return enabledScopes.includes(scope);
+ return enabledScopes.includes(scope) ? [scope] : false;
  } else {
- return scope.every(s => enabledScopes.includes(s));
+ return scope.every(s => enabledScopes.includes(s)) ? scope : false;
  }
  }