Allows users to update their own profile.

Sports that user can add as interests are:

   FOOTBALL, CRICKET, FIELD HOCKEY, TENNIS, VOLLEYBALL, TABLE TENNIS, BASKETBALL, BASEBALL, RUGBY,

   GOLF, ATHLETICS, FORMULA 1, BOXING, ICE HOCKEY, AMERICAN FOOTBALL, MMA, MOTOGP, BADMINTON, CYCLING,

   SNOOKER, GYMNASTICS, HANDBALL, WRESTLING, HORSE RACING, WEIGHT LIFTING, CHESS, SQUASH, BIATHLON,

   WINTER SPORTS, MARTIAL ARTS, WATER SPORTS, SHOOTING, RALLY, RHYTHMIC GYMNASTICS,

Caching: None.

Authentication: Personal Bearer token acquired from Firebase