update project configuration and test harness

Author: emmanvg

.travis.yml

@@ -1,24 +1,28 @@
+os: linux
 language: python
-
+cache: pip
+dist: xenial
 python:
-  - "2.6"
   - "2.7"
   - "3.4"
   - "3.5"
   - "3.6"
-
+  - "3.7"
+  - "3.8"
+jobs:
+  include:
+    # https://blog.travis-ci.com/2019-04-15-xenial-default-build-environment
+    # https://travis-ci.community/t/issue-with-python-2-6-on-linux/3861/2
+    - python: 2.6
+      dist: trusty
 before_install:
   - sudo apt-get install -qq libxml2
-
 install:
   - pip install -U tox-travis
-
 script: tox
-
 branches:
   only:
     - master
-
 notifications:
   email:
     - stix-commits-list@groups.mitre.org

setup.cfg

@@ -9,3 +9,6 @@ tag = True
 [bumpversion:file:sdv/version.py]
 
 [bumpversion:file:docs/getting_started.rst]
+
+[metadata]
+license_file = LICENSE.txt

setup.py

@@ -31,13 +31,22 @@ def get_version():
     readme = f.read()
 
 install_requires = [
-    'lxml>=3.3.5',
     'xlrd>=0.9.2',
     'ordereddict',
     'mixbox>=1.0.5',
     'python-dateutil'
 ]
 
+# lxml has dropped support for Python 2.6, 3.3 after version 4.2.6
+if (py_maj, py_minor) == (2, 6) or (py_maj, py_minor) == (3, 3):
+    install_requires.append('lxml>=3.3.5,<4.3.0')
+# lxml has dropped support for Python 2.6, 3.3, 3.4 after version 4.4.0
+elif (py_maj, py_minor) == (2, 6) or (py_maj, py_minor) == (3, 4):
+    install_requires.append('lxml>=3.3.5,<4.4.0')
+else:
+    install_requires.append('lxml>=3.3.5')
+
+
 # Python 2.6 does not come with argparse
 try:
     import argparse
@@ -90,5 +99,7 @@ def get_version():
         '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',
     ]
 )

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py26, py27, py34, py35, py36
+envlist = py26, py27, py34, py35, py36, py37, py38
 
 [testenv]
 commands =
@@ -23,3 +23,5 @@ python =
   3.4: py34
   3.5: py35
   3.6: py36
+  3.7: py37
+  3.8: py38