Anya Post-Michaelsen

* Change `.bashrc` file reference to the corresponding `.zshrc` file for Mac M1 * Provide alternate path names for conda to add to `$PATH` for Mac M1 * I do...

In the [Unit Testing](https://carpentries-incubator.github.io/python-testing/04-units/index.html) module of the Carpentries [Python Testing & Continuous Integration Tutorial](https://carpentries-incubator.github.io/python-testing/), the tests all use the less reliable `assert a == b` instead of `numpy.testing.assert_allclose(a,b)`.