Updated supported versions of Python

- dropped obsolete versions like py26, py33, py34
- added newer releases py37, py38
- fixed broken test on py37+

.gitignore

@@ -1,2 +1,3 @@
 __pycache__/
 *.py[co]
+.tox

.travis.yml

@@ -4,14 +4,13 @@ os:
 language: python
 
 python:
-    - 2.6
     - 2.7
-    - pypy
-    - 3.3
-    - 3.4
     - 3.5
     - 3.6
-    - pypy-5.3.1
+    - 3.7
+    - 3.8
+    - pypy
+    - pypy3.5
 
 before_script:
     - pip install -r requirements-dev.txt

setup.py

@@ -39,15 +39,12 @@ def read(*parts):
         "License :: OSI Approved :: MIT License",
         "Programming Language :: Python",
         "Programming Language :: Python :: 2",
-        "Programming Language :: Python :: 2.6",
         "Programming Language :: Python :: 2.7",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.1",
-        "Programming Language :: Python :: 3.2",
-        "Programming Language :: Python :: 3.3",
-        "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 :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",
         "Topic :: Software Development :: Build Tools",

test.py

@@ -511,6 +511,7 @@ def test_environment(self):
         osx_cruft = [
             "__CF_USER_TEXT_ENCODING",
             "__PYVENV_LAUNCHER__",
+            "LC_CTYPE",
             "VERSIONER_PYTHON_PREFER_32_BIT",
             "VERSIONER_PYTHON_VERSION",
         ]

tox.ini

@@ -0,0 +1,12 @@
+[tox]
+envlist = py{27,35,36,37,38},docs
+
+[testenv]
+deps = -r requirements-dev.txt
+commands =
+    python sh.py travis
+
+[testenv:docs]
+basepython = python3
+commands =
+    python setup.py check --restructuredtext --metadata --strict