README.md: Update the coveralls badge

The coveralls.io badge wasn't consistently updating
after a successful run.  Remove the "?branch=master"
parameter and switch to using a png rather than an
svg.

Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>

diff --git a/README.md b/README.md
index 541fd97740d99555e47813f264e394b4cac1815d..6094e5f3e05855c0c5783df8eac766a911e1c3e1 100644 (file)
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
 [![Build Status](https://github.com/libcgroup/libcgroup/workflows/Continuous%20Integration/badge.svg?branch=master)](https://github.com/libcgroup/libcgroup/actions)
-[![Coverage Status](https://coveralls.io/repos/github/libcgroup/libcgroup/badge.svg?branch=master)](https://coveralls.io/github/libcgroup/libcgroup?branch=master)
+[![Coverage Status](https://coveralls.io/repos/github/libcgroup/libcgroup/badge.png)](https://coveralls.io/github/libcgroup/libcgroup)
 
 The entire libcgroup README is available [here](README).