Request: add missing git tag for release v5.2.1

Hi there - could you please add a tag to this git repository corresponding to the v5.2.1 release of the package on NPM? I _think_ the relevant commit ID is: 2bb7b050a8916b649ba08edfe23babdc0846ec3f (it's very similar to the release of v5.2[.0] from the same day, with some added bounds-checking for logarithms, I think) Thank you!