[ANN] minitest-sprint 1.2.1 Released

minitest-sprint version 1.2.1 has been released!

* home: <https://github.com/seattlerb/minitest-sprint>
* rdoc: <http://docs.seattlerb.org/minitest-sprint>

Runs (Get it? It's fast!) your tests and makes it easier to rerun individual
failures.

Changes:

### 1.2.1 / 2019-09-22

* 1 minor enhancement:

  * Refactored and moved bin/minitest to Minitest::Sprint.run.

* 1 bug fix:

  * Fixed a bug where having only options would prevent default "test" directory arg.