Bump copyright year

Author: dteoh

README.md

@@ -80,7 +80,7 @@ provided.
 ```
 DevDocs for macOS
 
-Copyright (C) 2019 Douglas Teoh
+Copyright (C) 2020 Douglas Teoh
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by

devdocs-macos/Info.plist

@@ -28,7 +28,7 @@
 		<true/>
 	</dict>
 	<key>NSHumanReadableCopyright</key>
-	<string>Copyright © 2019 Douglas Teoh. All rights reserved.</string>
+	<string>Copyright © 2020 Douglas Teoh. All rights reserved.</string>
 	<key>NSMainNibFile</key>
 	<string>MainMenu</string>
 	<key>CFBundleURLTypes</key>