Bump readme for v3.x
Bump readme for v3.x

cliqz-oss/browser-ios,cliqz-oss/browser-ios,cliqz-oss/browser-ios,sharath-cliqz/browser-ios,sharath-cliqz/browser-ios,sharath-cliqz/browser-ios,cliqz-oss/browser-ios,cliqz-oss/browser-ios,cliqz-oss/browser-ios,sharath-cliqz/browser-ios,sharath-cliqz/browser-ios,sharath-cliqz/browser-ios,sharath-cliqz/browser-ios,sharath-cliqz/browser-ios,cliqz-oss/browser-ios,cliqz-oss/browser-ios