[json-glib] docs: Update the README file

[Emmanuele Bassi <ebassi src gnome org>]

commit bc2514d4c9aba5bec49bfc961282b3ec8a910869
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Jun 8 17:31:54 2021 +0100

    docs: Update the README file

 README.md | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)
---
diff --git a/README.md b/README.md
index 9c9d56d..4bde590 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ GLib is a C library providing common and efficient data types for the C
 developers.
 
 GObject is a library providing a run-time Object Oriented type system for C
-developers. GLib and GObject are extensively used by the GTK+ toolkit and by the
+developers. GLib and GObject are extensively used by the GTK toolkit and by the
 [GNOME][gnome] project.
 
 For more information, see:
@@ -34,9 +34,8 @@ In order to build JSON-GLib you will need:
  * [ninja](http://ninja-build.org)
  * [meson](http://mesonbuild.com)
  * pkg-config
- * gtk-doc ≥ 1.13 (optional)
- * GLib, GIO ≥ 2.38
- * GObject-Introspection ≥ 1.38 (optional)
+ * GLib, GIO ≥ 2.54
+ * GObject-Introspection ≥ 1.54 (optional)
 
 Build and installation
 --------------------------------------------------------------------------------
@@ -44,9 +43,9 @@ To build JSON-GLib just run:
 
 ```sh
   $ meson _build .
-  $ ninja -C _build
+  $ meson -C _build
   $ meson test -C _build
-  $ sudo ninja -C _build install
+  $ meson install -C _build
 ```
 
 See the [Meson documentation](http://mesonbuild.com) for more information.
@@ -81,7 +80,7 @@ merge request on Gitlab:
     https://gitlab.gnome.org/GNOME/json-glib/merge_requests/new
 
 Please, try to conform to the coding style used by JSON-GLib, which is the same
-used by projects like GLib, [GTK+][gtk-coding-style], and Clutter. Coding style
+used by projects like GLib, [GTK][gtk-coding-style], and Clutter. Coding style
 conformance is a requirement for upstream acceptance.
 
 Make sure you always run the test suite when you are fixing bugs. New features
@@ -112,8 +111,8 @@ Copyright 2009, 2010, 2011, 2012  Intel Corp.
 Copyright 2013  Emmanuele Bassi
 
 [json]: http://www.json.org "JSON"
-[glib]: http://www.gtk.org "GTK+"
+[glib]: http://www.gtk.org "GTK"
 [json-glib]: https://wiki.gnome.org/Projects/JsonGlib "JSON-GLib wiki"
 [gnome]: https://www.gnome.org "GNOME"
 [gitlab-issues]: https://gitlab.gnome.org/GNOME/json-glib/issues
-[gtk-coding-style]: https://git.gnome.org/browse/gtk+/tree/docs/CODING-STYLE
+[gtk-coding-style]: https://gitlab.gnome.org/GNOME/gtk/-/blob/HEAD/docs/CODING-STYLE.md