Update binder link in README.md

point link to the index.ipynb for the binder button

Author: HaleySchuhl

README.md

@@ -2,7 +2,7 @@
 
 [![test-pr](https://github.com/danforthcenter/plantcv-tutorial-unsupervised-ml/actions/workflows/ci-tests.yml/badge.svg)](https://github.com/danforthcenter/plantcv-tutorial-unsupervised-ml/actions/workflows/ci-tests.yml)
 
-[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/danforthcenter/plantcv-tutorial-unsupervised-ml/HEAD)
+[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/danforthcenter/plantcv-tutorial-unsupervised-ml/HEAD?labpath=index.ipynb)
 
 [![Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/danforthcenter/plantcv-tutorial-unsupervised-ml/blob/main/index-Colab.ipynb)