Fix typo in readme
Fix typo in readme

LeSuisse/securimag-web-challenge-sept-2015,LeSuisse/challenges,LeSuisse/challenges,LeSuisse/securimag-web-challenge-sept-2015,LeSuisse/securimag-web-challenge-sept-2015,LeSuisse/securimag-web-challenge-sept-2015,LeSuisse/challenges,LeSuisse/securimag-web-challenge-sept-2015,LeSuisse/challenges,LeSuisse/challenges