Update install requirements

Author: paulromano

setup.py

@@ -35,9 +35,9 @@
     ],
 
     # Dependencies
-    'python_requires': '>=3.5',
+    'python_requires': '>=3.6',
     'install_requires': [
-        'openmc>0.12.0', 'numpy', 'matplotlib', 'PySide2'
+        'openmc>0.12.2', 'numpy', 'matplotlib', 'PySide2'
     ],
     'extras_require': {
         'test' : ['pytest', 'pytest-qt'],