It shall be lawful for any number, not less than twenty percent (20%) of the qualified electors of any municipality, by petition, to propose an amendment or amendments to the charter of such municipality not in conflict with the Constitution and laws of the United States, or the Constitution of this state. The said amendment or amendments shall be published for three (3) weeks prior to a special election in a newspaper published in the municipality, if there be one, and if not, by posting for said time in at least three (3) public places therein. The publication of the amendment or amendments may be made as provided in Section 21-17-19. If such election results in favor of any such amendment or amendments, then the amendment or amendments shall be submitted to the Governor, as is provided in Section 21-17-9, and the procedure therein outlined shall be followed, except that it shall not be necessary to republish such amendment or amendments, or resubmit such amendment or amendments for approval of the qualified electors.