docs: update readme for clarity

Signed-off-by: Mike Fiedler <miketheman@gmail.com>

README.md

@@ -19,15 +19,15 @@ tests to ensure network calls are prevented.
 
 ## Requirements
 
-- [Pytest](https://github.com/pytest-dev/pytest) 3.6.3 or greater
+- [Pytest](https://github.com/pytest-dev/pytest) 6.2.5 or greater
 
 ## Installation
 
 You can install `pytest-socket` via [pip](https://pypi.python.org/pypi/pip/)
 from [PyPI](https://pypi.python.org/pypi):
 
 ```console
-$ pip install pytest-socket
+pip install pytest-socket
 ```
 
 or add to your `pyproject.toml` for [poetry](https://python-poetry.org/):
@@ -104,7 +104,6 @@ or for whole test run
 addopts = --allow-hosts=127.0.0.1,127.0.1.1
 ```
 
-
 ### Frequently Asked Questions
 
 Q: Why is network access disabled in some of my tests but not others?