Require >3.4 since NI Linux RT ARM still ships 3.5

Author: strainmike

setup.py

@@ -31,7 +31,7 @@ def get_long_description():
       version=get_version(),
       packages=find_packages(),
       install_requires=['future'],
-      python_requires=">3.5",
+      python_requires=">3.4",
       package_data={'nifpga': ['VERSION']},
       author="National Instruments",
       url="https://github.com/ni/nifpga-python",