removing basepython hard coded values

tox.ini

@@ -7,6 +7,7 @@
 envlist = py35, py36, py37, py38, py39, pypy, flake8, pylint-errors, pylint-full, verify-manifest
 
 [testenv]
+description = run the unit tests with pytest under {basepython}
 commands = nosetests --with-timer
 install_command = pip install --prefer-binary {opts} {packages}
 
@@ -42,7 +43,7 @@ deps =
     mock
     
 [testenv:flake8]
-basepython = python3.9
+#basepython = python3.9
 commands =
     flake8 minecraft tests setup.py start.py bin/generate_travis_yml.py
 deps =
@@ -55,14 +56,14 @@ per-file-ignores =
     minecraft/networking/packets/__init__.py:F401
 
 [testenv:pylint-errors]
-basepython = python3.9
+#basepython = python3.9
 deps =
     {[testenv]deps}
     pylint
 commands = pylint minecraft -E
 
 [testenv:pylint-full]
-basepython = python3.9
+#basepython = python3.9
 deps =
     {[testenv]deps}
     pylint
@@ -70,7 +71,7 @@ commands =
     - pylint minecraft --disable=E
 
 [testenv:docs]
-basepython = python3.9
+#basepython = python3.9
 deps =
     {[testenv:cover]deps}
     sphinx
@@ -79,7 +80,7 @@ commands =
     {toxinidir}/bin/build_docs
 
 [testenv:verify-manifest]
-basepython = python3.9
+#basepython = python3.9
 deps =
     check-manifest
 commands =