[pygobject] README: remove coverage badge, gitlab can now show them on the project page

[Christoph Reiter <creiter src gnome org>]

commit f89f3e628c7fb40acb629a37b45c26b13f932de2
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Sun May 13 11:12:37 2018 +0200

    README: remove coverage badge, gitlab can now show them on the project page

 README.rst | 5 -----
 1 file changed, 5 deletions(-)
---
diff --git a/README.rst b/README.rst
index e0ff25bf..aaf513ee 100644
--- a/README.rst
+++ b/README.rst
@@ -1,8 +1,3 @@
-.. image:: https://gitlab.gnome.org/GNOME/pygobject/badges/master/coverage.svg
-   :target: https://gnome.pages.gitlab.gnome.org/pygobject
-
-ᅟ
-
 .. image:: https://pygobject.readthedocs.io/en/latest/_images/pygobject.svg
    :align: center
    :width: 400px