add none lexor to citation.rst
add none lexor to citation.rst

D-K-E/cltk,eamonnbell/cltk,coderbhupendra/cltk,TylerKirby/cltk,LBenzahia/cltk,TylerKirby/cltk,marpozzi/cltk,LBenzahia/cltk,kylepjohnson/cltk,cltk/cltk,diyclassics/cltk,mbevila/cltk