Remove OrderedDict from setup.py

So we don't have to mess with collections.abc changing in python
versions

Author: tony

setup.py

@@ -1,6 +1,5 @@
 """tmuxp lives at <https://github.com/tmux-python/tmuxp>."""
 import sys
-from collections import OrderedDict
 
 from setuptools import setup
 from setuptools.command.test import test as TestCommand
@@ -41,13 +40,11 @@ def run_tests(self):
     name=about['__title__'],
     version=about['__version__'],
     url=about['__github__'],
-    project_urls=OrderedDict(
-        (
-            ('Documentation', about['__docs__']),
-            ('Code', about['__github__']),
-            ('Issue tracker', about['__tracker__']),
-        )
-    ),
+    project_urls={
+        'Documentation': about['__docs__'],
+        'Code': about['__github__'],
+        'Issue tracker': about['__tracker__'],
+    },
     download_url=about['__pypi__'],
     license=about['__license__'],
     author=about['__author__'],