Version discrepancy between Hex Package Manager and Github

Hi, 

I have trouble to find the correct corresponding source code to quantile_estimator:0.2.1 (RabbitMQ is using it). 

https://hex.pm/packages/quantile_estimator/0.2.1

does not correspond to any tag in this repository.

Is this the correct one? https://github.com/odo/quantile_estimator/commit/eeea7c7dba2f406a41c70b0f59afcf4a6b2fc4fc

