correct the list of suported python versions

2.7 was not supported or tested for a long time. PyPy is also not tested

closes #67

Author: Cube707

README.rst

@@ -29,7 +29,7 @@ Installation
 
    pip install readchar
 
-The :code:`readchar` library works with python 2.7, 3.4, 3.5, 3.6 and Pypy.
+The :code:`readchar` library works with python 3.5, 3.6, 3.7, 3.8, 3.9 and 3.10.
 
 Usage
 -----

setup.py

@@ -53,15 +53,13 @@ def run_tests(self):
         "Intended Audience :: Developers",
         "License :: OSI Approved :: MIT License",
         "Operating System :: OS Independent",
-        "Programming Language :: Python :: 2.7",
-        "Programming Language :: Python :: 3.4",
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: Implementation :: CPython",
-        "Programming Language :: Python :: Implementation :: PyPy",
         "Topic :: Software Development",
         "Topic :: Software Development :: User Interfaces",
     ],