update README.md

[maven-release-plugin] copy for tag 1.2

SONARGITUB-19 Improve error reporting

SONARGITUB-20 Fix global comment

* issues on folders
* when summary per severity is missing
* when nothing reported inline

SONARGITUB-20 Improve global comment

Improve coverage

[maven-release-plugin] copy for tag 1.1

SONARGITUB-14 Do not rely only on sonar.dryRun property since it was …

…removed in 5.2

SONARGITUB-14 Do not rely only on sonar.dryRun property since it was …

…removed in 5.2

Update README.md