Remove Py3.4 trove classifier, add python_requires (#755)

* Remove Py3.4 classifier, add python_requires

* Remove space.

Author: PGijsbers

setup.py

@@ -28,6 +28,7 @@
                  version=version,
                  packages=setuptools.find_packages(),
                  package_data={'': ['*.txt', '*.md']},
+                 python_requires=">=3.5",
                  install_requires=[
                      'liac-arff>=2.4.0',
                      'xmltodict',
@@ -72,7 +73,6 @@
                               'Operating System :: Unix',
                               'Operating System :: MacOS',
                               'Programming Language :: Python :: 3',
-                              'Programming Language :: Python :: 3.4',
                               'Programming Language :: Python :: 3.5',
                               'Programming Language :: Python :: 3.6',
                               'Programming Language :: Python :: 3.7'])