Remove codecov badge, as the link does not work

Also, every time I would like to log in to codecov.io with my github
account, it tells me that it wants complete read and write access to all
my repositories, which I do not want to grant for obvious reasons.

1 files changed, 0 insertions, 1 deletions

diff --git a/README.md b/README.md
index ca698853..1f7debd9 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,6 @@
 [![](https://www.r-pkg.org/badges/version/mkin)](https://cran.r-project.org/package=mkin)
 [![mkin status badge](https://jranke.r-universe.dev/badges/mkin)](https://jranke.r-universe.dev/ui/#package:mkin)
 [![Build Status](https://travis-ci.com/jranke/mkin.svg?branch=main)](https://app.travis-ci.com/github/jranke/mkin)
-[![codecov](https://codecov.io/github/jranke/mkin/branch/main/graphs/badge.svg)](https://codecov.io/github/jranke/mkin)
 
 The [R](https://www.r-project.org) package **mkin** provides calculation routines for the analysis of
 chemical degradation data, including <b>m</b>ulticompartment <b>kin</b>etics as