MSS: fix a ResourceWarning: unclosed file in setup.py

Author: BoboTiG

CHANGELOG

@@ -4,6 +4,7 @@ History:
 
 3.3.0   2018/08/xx
       - Linux: add an error handler for the XServer to prevent interpreter crash (fix #61)
+      - MSS: fix a ResourceWarning: unclosed file in setup.py
       - tests: fix a ResourceWarning: unclosed file
       - big code clean-up using black
 

setup.py

@@ -39,6 +39,10 @@
     "Programming Language :: Python :: 3.7",
     "Topic :: Multimedia :: Graphics :: Capture :: Screen Capture",
 ]
+
+with open("README.rst") as f:
+    description = f.read()
+
 config = {
     "name": "mss",
     "version": __version__,
@@ -51,7 +55,7 @@
         "An ultra fast cross-platform multiple screenshots module "
         "in pure python using ctypes."
     ),
-    "long_description": open("README.rst").read(),
+    "long_description": description,
     "classifiers": classifiers,
     "platforms": ["Darwin", "Linux", "Windows"],
     "packages": ["mss"],