prep for python 3.9

Author: gonzalocasas

requirements.txt

@@ -10,8 +10,7 @@ matplotlib >= 3.1; python_version >= '3.8' and sys_platform == 'win32'
 matplotlib >= 2.2; python_version >= '3.5' and sys_platform != 'win32'
 networkx
 numba
-numpy >= 1.15.4, <= 1.19.3; sys_platform == 'win32'
-numpy >=1.15.4; sys_platform != 'win32'
+numpy >= 1.15.4
 pillow
 planarity
 pycollada

setup.py

@@ -48,6 +48,7 @@ def read(*names, **kwargs):
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: Implementation :: CPython',
     ],
     keywords=['architecture', 'engineering', 'fabrication', 'construction'],