Switch history to attributions

Author: saulshanabrook

README.md

@@ -152,12 +152,12 @@ pytest jupyterlab_git
 jlpm run test
 ```
 
-Whenever you release a new version of this extension please update the history section below as needed.
+## Attributions
 
-## History
+Extension development has been sponsored at various times by the following organizations:
 
-*Up to date as of February 2020*
-
-The JupyterLab Git extension was created by [Brian Granger](https://github.com/ellisonbg), [Ji Zhang](https://github.com/zzhangjii), [Hana Zarea](https://github.com/hzarea), [Noah Stapp](https://github.com/NoahStapp), and [Ashutosh Bondre](https://github.com/ashutoshbondre) as a part of the [Jupyter Cal Poly](https://github.com/jupytercalpoly) summer internship program. [Jaipreet Singh](https://github.com/jaipreet-s), [Neelam Gehlot](https://github.com/neelamgehlot), and [Saul Shanabrook](https://github.com/saulshanabrook) then pushed forward on adding a number of features as part of [Amazon Web Services](https://github.com/aws)'s investment in the extension. Both [Konstantin Taletskiy](https://github.com/ktaletsk) at [LabShare](https://github.com/LabShare) and [Frédéric Collonval](https://github.com/fcollonval) at the [Safran Group](https://www.safran-group.com/) have been contributing since then. [Max Klein](https://github.com/telamonian) and [Athan](https://github.com/kgryte) have also contributing sponsored by [the D. E. Shaw group](https://www.deshaw.com/)..
-
-Many others have contributed as well, in [code contributions](https://github.com/jupyterlab/jupyterlab-git/graphs/contributors), funding, design, and guidance. Of course this project also exists only because of the monumental efforts at all levels of open source, in particular to the JupyterLab and Jupyter ecosystems, which this directly builds on.
+-  **[Jupyter Cal Poly](https://github.com/jupytercalpoly)**: [Brian Granger](https://github.com/ellisonbg), [Ji Zhang](https://github.com/zzhangjii), [Hana Zarea](https://github.com/hzarea), [Noah Stapp](https://github.com/NoahStapp), and [Ashutosh Bondre](https://github.com/ashutoshbondre).
+- **[Amazon Web Services](https://github.com/aws)**: [Jaipreet Singh](https://github.com/jaipreet-s), [Neelam Gehlot](https://github.com/neelamgehlot), and [Saul Shanabrook](https://github.com/saulshanabrook).
+-  **[LabShare](https://github.com/LabShare)**: [Konstantin Taletskiy](https://github.com/ktaletsk).
+-  **[Safran Group](https://www.safran-group.com/)**: [Frédéric Collonval](https://github.com/fcollonval).
+-  **D. E. Shaw group**: [Max Klein](https://github.com/telamonian) and [Athan](https://github.com/kgryte).