Remove reference to Travis-CI and reinstate coverage

README.md

@@ -1,8 +1,8 @@
 # O(1) heap
 
 [![Main Workflow](https://github.com/pavel-kirienko/o1heap/actions/workflows/main.yml/badge.svg)](https://github.com/pavel-kirienko/o1heap/actions/workflows/main.yml)
-[![Build Status](https://travis-ci.org/pavel-kirienko/o1heap.svg?branch=master)](https://travis-ci.org/pavel-kirienko/o1heap)
 [![Reliability Rating](https://sonarcloud.io/api/project_badges/measure?project=pavel-kirienko_o1heap&metric=reliability_rating)](https://sonarcloud.io/dashboard?id=pavel-kirienko_o1heap)
+[![Coverage](https://sonarcloud.io/api/project_badges/measure?project=pavel-kirienko_o1heap&metric=coverage)](https://sonarcloud.io/dashboard?id=pavel-kirienko_o1heap)
 
 O1heap is a highly deterministic constant-complexity memory allocator designed for
 hard real-time high-integrity embedded systems.