fix typo in setup.cfg it was causing issues during packaging

setup.cfg

@@ -5,7 +5,7 @@ [email protected]
 description=Set osxs accent/highlight colors using the commandline
 license = MIT
 long_description = file: README.md
-long_description_content_type = text/markdowm
+long_description_content_type=text/markdown
 keywords=osx colorscheme terminal-emulators changing-colorschemes
 url=https://github.com/yuhonas/osx-colors
 platforms = Darwin