Cherry-pick small copyright fix for 3.5.3 final.

Author: larryhastings

Mac/IDLE/IDLE.app/Contents/Info.plist

@@ -36,7 +36,7 @@
 	<key>CFBundleExecutable</key>
 	<string>IDLE</string>
 	<key>CFBundleGetInfoString</key>
-	<string>%version%, © 2001-2016 Python Software Foundation</string>
+	<string>%version%, © 2001-2017 Python Software Foundation</string>
 	<key>CFBundleIconFile</key>
 	<string>IDLE.icns</string>
 	<key>CFBundleIdentifier</key>