Fix py3.10; remove unused badges

Author: Apkawa

README.md

@@ -2,8 +2,6 @@
 [![ci](https://github.com/Apkawa/pytest-image-diff/actions/workflows/ci.yml/badge.svg)](https://github.com/Apkawa/pytest-image-diff/actions/workflows/ci.yml)
 [![Documentation Status](https://readthedocs.org/projects/pytest-image-diff/badge/?version=latest)](https://pytest-image-diff.readthedocs.io/en/latest/?badge=latest)
 [![Codecov](https://codecov.io/gh/Apkawa/pytest-image-diff/branch/master/graph/badge.svg)](https://codecov.io/gh/Apkawa/pytest-image-diff)
-[![Requirements Status](https://requires.io/github/Apkawa/pytest-image-diff/requirements.svg?branch=master)](https://requires.io/github/Apkawa/pytest-image-diff/requirements/?branch=master)
-[![PyUP](https://pyup.io/repos/github/Apkawa/pytest-image-diff/shield.svg)](https://pyup.io/repos/github/Apkawa/pytest-image-diff)
 [![PyPi Python versions](https://img.shields.io/pypi/pyversions/pytest-image-diff.svg)](https://pypi.python.org/pypi/pytest-image-diff)
 [![License](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
 

requirements-dev.txt

@@ -5,10 +5,8 @@ tox
 twine
 
 # Tests
-pytest>=4,<5
-pytest-pythonpath==0.7.3
-pytest-cov==2.8.1
-mock==3.0.5
+pytest>=6,<7
+pytest-cov==2.12.1
 
 # Docs