there is no revert message in source code

[startgeek]

I use test's in github for my refrence and in those test's all of the reverts has message that will fetched via shouldFail.reverting.withMessage(somePromise, 'and heres why I reverted');
I observed that It dosen't return any messages then I inspected the source code and I realized non of the Require() function has message so did I missing some thing here? whats going on?

💻 Environment: MacOS latest

version of OpenZeppelin :2.2.0

[frangio]

The revert messages were added recently in #1704.

They are in the latest release candidate which you can install via npm install openzeppelin-solidity@next.