Fix ResourceWarning: unclosed file in setup.py

Also prevent potential identical warning in `plat_other.py`.

send2trash/plat_other.py

@@ -112,9 +112,8 @@ def trash_move(src, dst, topdir=None):
     check_create(infopath)
 
     os.rename(src, op.join(filespath, destname))
-    f = open(op.join(infopath, destname + INFO_SUFFIX), "w")
-    f.write(info_for(src, topdir))
-    f.close()
+    with open(op.join(infopath, destname + INFO_SUFFIX), "w") as f:
+        f.write(info_for(src, topdir))
 
 
 def find_mount_point(path):

setup.py

@@ -17,9 +17,8 @@ CLASSIFIERS = [
     "Topic :: Desktop Environment :: File Managers",
 ]
 
-LONG_DESCRIPTION = (
-    open("README.rst", "rt").read() + "\n\n" + open("CHANGES.rst", "rt").read()
-)
+with open("README.rst", "rt") as f1, open("CHANGES.rst", "rt") as f2:
+    LONG_DESCRIPTION = f1.read() + "\n\n" + f2.read()
 
 setup(
     name="Send2Trash",