Update README (#322)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

Author: hugovk

readme.rst

@@ -2,15 +2,14 @@ blurb_it
 --------
 
 .. image:: https://img.shields.io/badge/code%20style-black-000000.svg
-    :target: https://github.com/ambv/black
+    :target: https://github.com/psf/black
 
 .. image:: https://github.com/python/blurb_it/actions/workflows/ci.yml/badge.svg?event=push
     :target: https://github.com/python/blurb_it/actions
 
-.. image:: https://codecov.io/gh/python/blurb_it/branch/master/graph/badge.svg
+.. image:: https://codecov.io/gh/python/blurb_it/branch/main/graph/badge.svg
     :target: https://codecov.io/gh/python/blurb_it
 
-
 ``blurb add`` over the internet.
 
 About
@@ -19,8 +18,9 @@ About
 📜🤖 blurb-it allows you to add a misc/news file to your own
 `CPython <https://github.com/python/cpython>`_ pull request.
 
-Misc/News file `is needed <https://devguide.python.org/committing/#what-s-new-and-news-entries>`_ for
-almost all non-trivial changes to CPython.
+A ``Misc/NEWS.d`` file `is needed
+<https://devguide.python.org/core-developers/committing/index.html#updating-news-and-what-s-new-in-python>`_
+for almost all non-trivial changes to CPython.
 
 To use blurb-it, you must be logged in to GitHub.
 
@@ -61,11 +61,10 @@ Requirements and dependencies
 - cryptography
 
 
-Running Tests
+Running tests
 =============
 
-1. Install pyhon virtual environment with `$ python3 -m venv venv`.
-2. Activate virtual environment with `$ . venv/bin/activate`.
-3. Install dev-requirements with `(venv)$ pip install -r dev-requirements.txt`.
-4. Run all test with `(venv)$ pytest tests`.
-
+1. Create a Python virtual environment with ``$ python3 -m venv venv``
+2. Activate the virtual environment with ``$ . venv/bin/activate``
+3. Install dev requirements with ``(venv)$ pip install -r dev-requirements.txt``
+4. Run all tests with ``(venv)$ pytest tests``