Remove Python<3.5 environments from tox configuration

This commit removes the tox environments for Python 2.7, 3.3, and 3.4,
since we no longer plan to officially support those versions.

Author: diazona

tox.ini

@@ -1,15 +1,12 @@
 [tox]
-envlist = py27,py33,py34,py35,py36,py37,py38,py39,py310
+envlist = py35,py36,py37,py38,py39,py310
 recreate = True
 
 [tox:hudson]
 downloadcache = {toxworkdir}/_download
 
 [gh-actions]
 python =
-    2.7: py27
-    3.3: py33
-    3.4: py34
     3.5: py35
     3.6: py36
     3.7: py37
@@ -29,4 +26,4 @@ deps =
 commands =
   py.test -v \
     --junitxml=junit-{envname}.xml \
-    {posargs}
+    {posargs}