Add dependency to windows-curses on windows

Author: bagage

setup.py

@@ -21,7 +21,8 @@
       include_package_data=True,
       install_requires=[
           "pygments",
-          "wcwidth"
+          "wcwidth",
+          "windows-curses; platform_system=='Windows'"
       ],
       entry_points={
           "console_scripts": ["suplemon=suplemon.cli:main"]