[ANN] lua-resty-sync is open source

[tokers]

Hi all！

We've just opened the source code for the library lua-resty-sync(see https://github.com/upyun/lua-resty-sync).

This library synchronize and save the data to shared memory at regular intervals based on the version changes.

Please see the README for the details.

This library has been running for a long time and it is stable, we will always maintain this library , issue and PR is welcome!