NIFI-5883 - Update README.md
NIFI-5883 - Update README.md

Signed-off-by: Pierre Villard <pierre.villard.fr@gmail.com>

This closes #3209.

trixpan/nifi,aperepel/nifi,mcgilman/nifi,ijokarumawak/nifi,bbende/nifi,mcgilman/nifi,m-hogue/nifi,jtstorck/nifi,pvillard31/nifi,pvillard31/nifi,mcgilman/nifi,m-hogue/nifi,pvillard31/nifi,jskora/nifi,trixpan/nifi,mattyb149/nifi,alopresto/nifi,mans2singh/nifi,jtstorck/nifi,patricker/nifi,mattyb149/nifi,mattyb149/nifi,aperepel/nifi,ijokarumawak/nifi,mcgilman/nifi,patricker/nifi,trixpan/nifi,patricker/nifi,YolandaMDavis/nifi,bbende/nifi,jfrazee/nifi,jfrazee/nifi,jskora/nifi,YolandaMDavis/nifi,joewitt/incubator-nifi,joewitt/incubator-nifi,YolandaMDavis/nifi,YolandaMDavis/nifi,m-hogue/nifi,jskora/nifi,jfrazee/nifi,YolandaMDavis/nifi,jfrazee/nifi,MikeThomsen/nifi,jfrazee/nifi,pvillard31/nifi,jtstorck/nifi,jfrazee/nifi,jtstorck/nifi,bbende/nifi,alopresto/nifi,patricker/nifi,pvillard31/nifi,jskora/nifi,jfrazee/nifi,MikeThomsen/nifi,mans2singh/nifi,joewitt/incubator-nifi,mans2singh/nifi,bbende/nifi,pvillard31/nifi,apsaltis/nifi,alopresto/nifi,mcgilman/nifi,joewitt/incubator-nifi,pvillard31/nifi,MikeThomsen/nifi,bbende/nifi,patricker/nifi,jtstorck/nifi,m-hogue/nifi,apsaltis/nifi,jfrazee/nifi,mans2singh/nifi,bbende/nifi,mattyb149/nifi,m-hogue/nifi,joewitt/incubator-nifi,jskora/nifi,patricker/nifi,apsaltis/nifi,apsaltis/nifi,alopresto/nifi,pvillard31/nifi,ijokarumawak/nifi,trixpan/nifi,alopresto/nifi,mcgilman/nifi,m-hogue/nifi,aperepel/nifi,joewitt/incubator-nifi,jtstorck/nifi,mattyb149/nifi,mans2singh/nifi,mans2singh/nifi,MikeThomsen/nifi,m-hogue/nifi,mcgilman/nifi,aperepel/nifi,MikeThomsen/nifi,YolandaMDavis/nifi,MikeThomsen/nifi,trixpan/nifi,aperepel/nifi,trixpan/nifi,mattyb149/nifi,apsaltis/nifi,jskora/nifi,jtstorck/nifi,ijokarumawak/nifi,MikeThomsen/nifi,alopresto/nifi,patricker/nifi,aperepel/nifi,YolandaMDavis/nifi,apsaltis/nifi,alopresto/nifi,mattyb149/nifi,ijokarumawak/nifi,ijokarumawak/nifi