Added backers and sponsors on the README
Added backers and sponsors on the README

rofrischmann/fela,RafalFilipek/fela,derek-duncan/fela,risetechnologies/fela,risetechnologies/fela,RafalFilipek/fela,derek-duncan/fela,risetechnologies/fela,derek-duncan/fela,RafalFilipek/fela,rofrischmann/fela,RafalFilipek/fela,derek-duncan/fela,RafalFilipek/fela,RafalFilipek/fela,derek-duncan/fela,rofrischmann/fela,derek-duncan/fela