README: added release badge
README: added release badge

dzc34/Contrast-Finder,Asqatasun/Contrast-Finder,Asqatasun/Contrast-Finder,Asqatasun/Contrast-Finder,dzc34/Contrast-Finder,dzc34/Contrast-Finder,Asqatasun/Contrast-Finder,dzc34/Contrast-Finder