Drop support for EOL Python 3.3 (#1019)

tox.ini

@@ -1,8 +1,8 @@
 [tox]
-envlist = py27, py33, py34, py35, py36
+envlist = py27, py34, py35, py36
 [testenv]
 deps =
-    pytest>=2.3.5, < 3.3
+    pytest>=2.3.5
     pytest-cache
 # docopt for sith doctests
     docopt
@@ -19,7 +19,6 @@ setenv =
 # To test Jedi in different versions than the same Python version, set a
 # different test environment.
     env27: JEDI_TEST_ENVIRONMENT=27
-    env33: JEDI_TEST_ENVIRONMENT=33
     env34: JEDI_TEST_ENVIRONMENT=34
     env35: JEDI_TEST_ENVIRONMENT=35
     env36: JEDI_TEST_ENVIRONMENT=36
@@ -33,10 +32,6 @@ deps =
 # numpydoc for typing scipy stack
     numpydoc
     {[testenv]deps}
-[testenv:py33]
-deps =
-    typing
-    {[testenv]deps}
 [testenv:py34]
 deps =
     typing