Drop support for Python versions older than 3.5

.travis.yml

@@ -3,8 +3,6 @@ language: python
 cache: pip
 dist: xenial
 python:
-  - "2.7"
-  - "3.4"
   - "3.5"
   - "3.6"
   - "3.7"
@@ -13,9 +11,9 @@ install:
   - pip install -U pip setuptools
   - pip install tox-travis
   - pip install codecov
-  - if [[ $TRAVIS_PYTHON_VERSION != 3.4 ]]; then pip install pre-commit; fi
+  - pip install pre-commit
 script:
   - tox
-  - if [[ $TRAVIS_PYTHON_VERSION != 3.4 ]]; then pre-commit run --all-files; fi
+  - pre-commit run --all-files
 after_success:
   - codecov

setup.py

@@ -39,10 +39,7 @@ setup(
         'Intended Audience :: Developers',
         'Topic :: Security',
         'License :: OSI Approved :: BSD License',
-        'Programming Language :: Python :: 2',
-        'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.4',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
@@ -51,7 +48,6 @@ setup(
     keywords='stix stix2 json cti cyber threat intelligence',
     packages=find_packages(exclude=['*.test', '*.test.*']),
     install_requires=[
-        'enum34 ; python_version<"3.4"',
         'pytz',
         'requests',
         'simplejson',

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py34,py35,py36,py37,py38,style,isort-check,packaging
+envlist = py35,py36,py37,py38,style,isort-check,packaging
 
 [testenv]
 deps =
@@ -42,8 +42,6 @@ commands =
 
 [travis]
 python =
-  2.7: py27, style
-  3.4: py34
   3.5: py35
   3.6: py36
   3.7: py37