update README

Author: atravitz

README.md

@@ -6,9 +6,9 @@
 # OpenFE Notebooks
 
 Collection of notebooks for the Open FreeEnergy project.
-These can be ran in the browser via the Binder links.
+These can be run in the browser via the Colab links.
 
-| Binder link | Description |
+| Colab link | Description |
 | --- | --- |
 | [![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/OpenFreeEnergy/ExampleNotebooks/blob/main/showcase/openfe_showcase.ipynb) | Start here.  This notebook demonstrates how a free energy calculation can be defined, executed and analyzed using the `openfe` package. |