coverage badge

Author: cblanquera

README.md

@@ -1,5 +1,7 @@
 # Stackpress Library
 
+[![Coverage Status](https://coveralls.io/repos/github/stackpress/lib/badge.svg?branch=main)](https://coveralls.io/github/stackpress/lib?branch=main)
+
 Shared library used across stackpress projects
 
 ## Install