Drop support of python 3.4

issue8203
review279171002

setup.py

@@ -90,7 +90,7 @@ setup(name=name,
         'Natural Language :: Dutch',
         'Natural Language :: French',
         'Operating System :: OS Independent',
-        'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3',
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
@@ -100,7 +100,7 @@ setup(name=name,
         'Topic :: Office/Business :: Financial :: Accounting',
         ],
     license='GPL-3',
-    python_requires='>=3.4',
+    python_requires='>=3.5',
     install_requires=requires,
     dependency_links=dependency_links,
     zip_safe=False,