docs: update readme (#66)

* doc: update readme

* docs: fix

* docs: fix again

README.md

@@ -3,7 +3,7 @@
 [![License](https://img.shields.io/pypi/l/nd2.svg?color=green)](https://github.com/tlambert03/nd2/raw/main/LICENSE)
 [![PyPI](https://img.shields.io/pypi/v/nd2.svg?color=green)](https://pypi.org/project/nd2)
 [![Python Version](https://img.shields.io/pypi/pyversions/nd2.svg?color=green)](https://python.org)
-[![Test](https://github.com/tlambert03/nd2/actions/workflows/test.yml/badge.svg)](https://github.com/tlambert03/nd2/actions/workflows/test.yml)
+[![Tests](https://github.com/tlambert03/nd2/actions/workflows/ci.yml/badge.svg)](https://github.com/tlambert03/nd2/actions/workflows/ci.yml)
 [![codecov](https://codecov.io/gh/tlambert03/nd2/branch/main/graph/badge.svg)](https://codecov.io/gh/tlambert03/nd2)
 
 Yet another `.nd2` (Nikon NIS Elements) file reader.