chore(release): 2.1.0 [skip ci]

# [2.1.0](https://gitlab.com/to-be-continuous/k6/compare/2.0.1...2.1.0) (2022-05-01)

### Features

* configurable tracking image ([3da1826d](https://gitlab.com/to-be-continuous/k6/commit/3da1826da0ae2b4e34bd2af0ac1b19dc6f52d4f1))