Update README.md
Some big fix see: https://github.com/EELV-fr/mailnotify/issues/12
fix email link (close enough); fix file change in a subfolder of a share
now clean forgotten nm_upload entry
fix group share notification
Merge pull request #14 from EELV-fr/v3.0.0-rc.1-DEV

V3.0.0 rc.1 dev