README.md: Add Coverity badge.
diff --git a/README.md b/README.md
index b579f95..bd8f989 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
[![Build status (travis-ci.com)](https://img.shields.io/travis/mity/md4c/master.svg?label=linux%20build)](https://travis-ci.org/mity/md4c)
[![Build status (appveyor.com)](https://img.shields.io/appveyor/ci/mity/md4c/master.svg?label=windows%20build)](https://ci.appveyor.com/project/mity/md4c/branch/master)
[![Coverage](https://img.shields.io/coveralls/mity/md4c/master.svg)](https://coveralls.io/github/mity/md4c)
+[![Coverity Scan Build Status](https://img.shields.io/coverity/scan/mity-md4c.svg)](https://scan.coverity.com/projects/mity-md4c)
# MD4C Readme