[calls] README: Drop code coverage report

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit cc7d83b26f0d9b6cc21c3fb7ace78a8b009736b9
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Mon Nov 15 08:13:19 2021 +0100

    README: Drop code coverage report
    
    This is now included as a badge in Gitlab.

 README.md | 1 -
 1 file changed, 1 deletion(-)
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diff --git a/README.md b/README.md
index 77e7de9b..77fd4bd0 100644
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 # Calls
-[![Code 
coverage](https://gitlab.gnome.org/GNOME/calls/badges/master/coverage.svg)](https://gitlab.gnome.org/GNOME/calls/commits/master)
 
 A phone dialer and call handler.