rm the unit test badge

Author: chrishavlin

README.md

@@ -1,15 +1,12 @@
 # yt_xarray
 
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 [![PyPI version](https://badge.fury.io/py/yt_xarray.svg)](https://badge.fury.io/py/yt_xarray)
 [![Python Version](https://img.shields.io/pypi/pyversions/yt_xarray.svg?color=green)](https://python.org)
-[![pre-commit.ci status](https://results.pre-commit.ci/badge/github/data-exp-lab/yt_xarray/main.svg)](https://results.pre-commit.ci/latest/github/data-exp-lab/yt_xarray/main)
-[![tests](https://github.com/data-exp-lab/yt_xarray/workflows/tests/badge.svg)](https://github.com/data-exp-lab/yt_xarray/actions)
 [![codecov](https://codecov.io/gh/data-exp-lab/yt_xarray/branch/main/graph/badge.svg)](https://codecov.io/gh/data-exp-lab/yt_xarray)
+[![pre-commit.ci status](https://results.pre-commit.ci/badge/github/data-exp-lab/yt_xarray/main.svg)](https://results.pre-commit.ci/latest/github/data-exp-lab/yt_xarray/main)
 
 An interface between yt and xarray
 
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 ## Overview
 
 yt_xarray streamlines communication between