Merge branch '2-python-2-7-compatibility' into 'master'

Resolve "Python 2.7 compatibility"

Closes #2

See merge request km3py/km3net-testdata!2

.gitlab-ci.yml

@@ -30,6 +30,15 @@ stages:
       reports:
         junit: "reports/junit*.xml"
 
+test-py2.7:
+    image: docker.km3net.de/base/python:2
+    stage: test
+    script:
+        - *virtualenv_definition
+        - make test
+    <<: *junit_definition
+    allow_failure: true
+
 test-py3.5:
     image: docker.km3net.de/base/python:3.5
     stage: test

setup.py

@@ -32,7 +32,7 @@ setup(
     platforms='any',
     setup_requires=['setuptools_scm'],
     use_scm_version=True,
-    python_requires='>=3.5',
+    python_requires='>=2.7',
     install_requires=read_stripped_lines("requirements.txt"),
     extras_require={"dev": read_stripped_lines("requirements-dev.txt")},
     classifiers=[