[evince/main] Rename default branch to main

[Germán Poo-Caamaño <gpoo src gnome org>]

commit 7572f3afd5108ae504a45710bd2cdfce0689b4a9
Author: Germán Poo-Caamaño <gpoo gnome org>
Date:   Sun Oct 10 23:06:50 2021 -0300

    Rename default branch to main

 README.md                       | 15 ++++++++++++++-
 org.gnome.Evince.appdata.xml.in |  4 ++--
 2 files changed, 16 insertions(+), 3 deletions(-)
---
diff --git a/README.md b/README.md
index 6c13a933..1c7d99f8 100644
--- a/README.md
+++ b/README.md
@@ -23,6 +23,19 @@ This software is licensed under the [GPLv2][license].
 * [LibTiff for Multipage TIFF viewing][tiff]
 * [LibGXPS for XML Paper Specification (XPS) viewing][xps]
 
+## Default branch renamed to `main`
+
+The default development branch of Evince has been renamed to `main`. To update
+your local checkout, use:
+```sh
+git checkout master
+git branch -m master main
+git fetch
+git branch --unset-upstream
+git branch -u origin/main
+git symbolic-ref refs/remotes/origin/HEAD refs/remotes/origin/main
+```
+
 [gnome]: https://www.gnome.org/start/
 [poppler]: https://poppler.freedesktop.org/
 [ghostscript]: https://www.freedesktop.org/wiki/Software/libspectre/
@@ -33,4 +46,4 @@ This software is licensed under the [GPLv2][license].
 [xps]: https://wiki.gnome.org/Projects/libgxps
 [license]: COPYING
 [evince-logo]: data/icons/scalable/apps/org.gnome.Evince.svg
-[flatpak]: 
https://upload.wikimedia.org/wikipedia/commons/thumb/a/a6/Flathub-badge-en.svg/240px-Flathub-badge-en.svg.png
\ No newline at end of file
+[flatpak]: 
https://upload.wikimedia.org/wikipedia/commons/thumb/a/a6/Flathub-badge-en.svg/240px-Flathub-badge-en.svg.png
diff --git a/org.gnome.Evince.appdata.xml.in b/org.gnome.Evince.appdata.xml.in
index 20175f5e..1de112b2 100644
--- a/org.gnome.Evince.appdata.xml.in
+++ b/org.gnome.Evince.appdata.xml.in
@@ -31,11 +31,11 @@
   </provides>
   <screenshots>
     <screenshot type="default">
-    <image>https://gitlab.gnome.org/GNOME/evince/raw/master/data/screenshots/evince-1.png</image>
+    <image>https://gitlab.gnome.org/GNOME/evince/raw/main/data/screenshots/evince-1.png</image>
     <caption>A clear, simple UI</caption>
     </screenshot>
     <screenshot>
-    <image>https://gitlab.gnome.org/GNOME/evince/raw/master/data/screenshots/evince-2.png</image>
+    <image>https://gitlab.gnome.org/GNOME/evince/raw/main/data/screenshots/evince-2.png</image>
     <caption>Advanced highlighting and annotation</caption>
     </screenshot>
   </screenshots>