Update copyright years.

This is a follow-up to commits
cb61a526c82153c09ed357901166a42b48ba9d3b and
12f12fbcb3cba4c634e10e7bf16a5c47d670f83b where the copyright year was
not updated.

* Makefile.am, build-aux/build-home-page.el, configure.ac, guix.scm:
Add 2021 to copyright.

4 files changed, 4 insertions, 4 deletions

diff --git a/Makefile.am b/Makefile.am
index c06bc57..b5f954f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,5 +1,5 @@
 # guile-xapian --- Guile bindings for Xapian
-# Copyright © 2020 Arun Isaac <arunisaac@systemreboot.net>
+# Copyright © 2020, 2021 Arun Isaac <arunisaac@systemreboot.net>
 #
 # This file is part of guile-xapian.
 #
diff --git a/build-aux/build-home-page.el b/build-aux/build-home-page.el
index d5faa9a..28ad552 100644
--- a/build-aux/build-home-page.el
+++ b/build-aux/build-home-page.el
@@ -1,5 +1,5 @@
 ;;; guile-xapian --- Guile bindings for Xapian
-;;; Copyright © 2020 Arun Isaac <arunisaac@systemreboot.net>
+;;; Copyright © 2021 Arun Isaac <arunisaac@systemreboot.net>
 ;;;
 ;;; This file is part of guile-xapian.
 ;;;
diff --git a/configure.ac b/configure.ac
index 693dfd5..ad713be 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 dnl guile-xapian --- Guile bindings for Xapian
-dnl Copyright © 2020 Arun Isaac <arunisaac@systemreboot.net>
+dnl Copyright © 2020, 2021 Arun Isaac <arunisaac@systemreboot.net>
 dnl
 dnl This file is part of guile-xapian.
 dnl
diff --git a/guix.scm b/guix.scm
index 93b55cb..44f0071 100644
--- a/guix.scm
+++ b/guix.scm
@@ -1,5 +1,5 @@
 ;;; guile-xapian --- Guile bindings for Xapian
-;;; Copyright © 2020 Arun Isaac <arunisaac@systemreboot.net>
+;;; Copyright © 2021 Arun Isaac <arunisaac@systemreboot.net>
 ;;;
 ;;; This file is part of guile-xapian.
 ;;;