docs: list new state related operators (#79)
docs: list new state related operators (#79)

yusufsafak/cerebral,FWeinb/cerebral,idream3/cerebral,cerebral/cerebral,garth/cerebral,fopsdev/cerebral,yusufsafak/cerebral,cerebral/cerebral,idream3/cerebral,FWeinb/cerebral,christianalfoni/cerebral,bdjnk/cerebral,bdjnk/cerebral,garth/cerebral,christianalfoni/cerebral,fopsdev/cerebral