Bump numpy requirement in install.py

Author: h-vetinari

setup.py

@@ -24,7 +24,7 @@ def is_platform_windows():
     return sys.platform == 'win32' or sys.platform == 'cygwin'
 
 
-min_numpy_ver = '1.9.0'
+min_numpy_ver = '1.12.0'
 setuptools_kwargs = {
     'install_requires': [
         'python-dateutil >= 2.5.0',