fixed "README : added screenshot + typo"
fixed "README : added screenshot + typo"

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