[gtk] docs: Style fixes for the contribution guidelines

[Emmanuele Bassi <ebassi src gnome org>]

commit fe45cf9c09a46ecb154612bd4d99a384d9ceb8df
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Mar 21 01:05:29 2018 +0000

    docs: Style fixes for the contribution guidelines

 CONTRIBUTING.md | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)
---
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 8438372a7e..af38fda299 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,20 +1,20 @@
 If you want to hack on the GTK+ project, you'll need to have the development
 tools appropriate for your operating system, including:
 
-       - Python 3.x
-       - Meson
-       - Ninja
-       - Gettext (19.7 or newer)
-       - a C99 compatible compiler
+ - Python 3.x
+ - Meson
+ - Ninja
+ - Gettext (19.7 or newer)
+ - a C99 compatible compiler
 
 Up-to-date instructions about developing GNOME applications and libraries
 can be found here:
 
-        https://developer.gnome.org
+ * https://developer.gnome.org
 
 Information about using GitLab with GNOME can be found here:
 
-        https://wiki.gnome.org/GitLab
+ * https://wiki.gnome.org/GitLab
 
 In order to get Git GTK+ installed on your system, you need to have the
 required versions of all the GTK+ dependencies; typically, this means a
@@ -60,4 +60,4 @@ $ git checkout -b your-branch
 
 Once you've finished working on the bug fix or feature, push the branch
 to the Git repository and open a new merge request, to let the GTK
-maintainers review your contribution.
\ No newline at end of file
+maintainers review your contribution.