Update copyright.

debian/changelog

@@ -3,6 +3,7 @@ compton-conf (0.15.0-0ubuntu1) UNRELEASED; urgency=medium
   * New upstream release.
   * Run wrap-and-sort.
   * Update upstream's signing key.
+  * Update copyright.
 
  -- Simon Quigley <tsimonq2@ubuntu.com>  Tue, 28 Apr 2020 16:27:57 -0500
 

debian/copyright

@@ -3,8 +3,8 @@ Upstream-Name: compton-conf
 Source: https://github.com/lxqt/compton-conf
 
 Files: *
-Copyright: 2013-2018 Hong Jen Yee (PCMan) <pcman.tw@gmail.com>
-           2013-2018 LXQt team
+Copyright: 2013-2020 Hong Jen Yee (PCMan) <pcman.tw@gmail.com>
+           2013-2020 LXQt team
 License: LGPL-2.1+
 
 Files: debian/*