Update README for v2.x branch.
Update README for v2.x branch.

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