title: Add SonarQube coverage via shields.io badge
body: <p>I have com.github.xxxxxx:xxxxxx Maven repository and I want add shields badge but I have a invalid badge:</p>
  
  <p><a href="https://img.shields.io/sonar/https/sonarqube.com/com.github.noraui:noraui/tech_debt.svg" rel="noreferrer">https://img.shields.io/sonar/https/sonarqube.com/com.github.noraui:noraui/tech_debt.svg</a></p>
  
  <p><a href="https://i.stack.imgur.com/Yi7tV.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Yi7tV.png" alt="enter image description here"></a></p>
  
  <p>Sonarqube xxxxxx project page: <a href="https://sonarqube.com/dashboard?id=com.github.xxxxxx%3Axxxxxx" rel="noreferrer">https://sonarqube.com/dashboard?id=com.github.xxxxxx%3Axxxxxx</a></p>
  
  <p><strong>I find a OK sample from an other sonar server:</strong></p>
  
  <p><a href="https://img.shields.io/sonar/http/sonar.qatools.ru/ru.yandex.qatools.allure:allure-core/coverage.svg" rel="noreferrer">https://img.shields.io/sonar/http/sonar.qatools.ru/ru.yandex.qatools.allure:allure-core/coverage.svg</a></p>
  
  <p><a href="https://img.shields.io/sonar/http/sonar.qatools.ru/ru.yandex.qatools.allure:allure-core/tech_debt.svg" rel="noreferrer">https://img.shields.io/sonar/http/sonar.qatools.ru/ru.yandex.qatools.allure:allure-core/tech_debt.svg</a></p>
  
  <p><a href="https://i.stack.imgur.com/5AWB3.png" rel="noreferrer"><img src="https://i.stack.imgur.com/5AWB3.png" alt="enter image description here"></a></p>