Remove eachdist from contributing documentation (#2782)

Fixes #2772

Co-authored-by: Srikanth Chekuri <srikanth.chekuri92@gmail.com>

CONTRIBUTING.md

@@ -45,15 +45,7 @@ during their normal contribution hours.
 
 ## Development
 
-To quickly get up and running, you can use the `scripts/eachdist.py` tool that
-ships with this project. First create a virtualenv and activate it.
-Then run `python scripts/eachdist.py develop` to install all required packages
-as well as the project's packages themselves (in `--editable` mode).
-
-You can then run `scripts/eachdist.py test` to test everything or
-`scripts/eachdist.py lint` to lint everything (fixing anything that is auto-fixable).
-
-Additionally, this project uses [tox](https://tox.readthedocs.io) to automate
+This project uses [tox](https://tox.readthedocs.io) to automate
 some aspects of development, including testing against multiple Python versions.
 To install `tox`, run: