Drop support for Python 2.7

Author: mdmintz

setup.py

@@ -1,6 +1,6 @@
 """
 The setup package to install SeleniumBase dependencies and plugins.
-(Uses selenium 4.x and is compatible with Python 2.7+ and Python 3.6+)
+(Uses selenium 4.x and is compatible with Python 3.6+)
 """
 
 from setuptools import setup, find_packages  # noqa: F401