[gi-docgen] Release gi-docgen 2021.4

[Emmanuele Bassi <ebassi src gnome org>]

commit b3b067a5d8da1af09c22c73675a6203d6d35bca2
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Thu Apr 15 14:54:18 2021 +0100

    Release gi-docgen 2021.4

 gidocgen/core.py | 2 +-
 meson.build      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gidocgen/core.py b/gidocgen/core.py
index cda1991..70a2716 100644
--- a/gidocgen/core.py
+++ b/gidocgen/core.py
@@ -1,4 +1,4 @@
 # SPDX-FileCopyrightText: 2020 GNOME Foundation <https://gnome.org>
 # SPDX-License-Identifier: Apache-2.0 OR GPL-3.0-or-later
 
-version = "2021.3"
+version = "2021.4"
diff --git a/meson.build b/meson.build
index 548529e..5384fe4 100644
--- a/meson.build
+++ b/meson.build
@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: Apache-2.0 OR GPL-3.0-or-later
 
 project('gi-docgen',
-  version: '2021.3',
+  version: '2021.4',
   meson_version: '>= 0.55.0',
 )