Every amendment to this chapter, including any map incorporated therein, adopted in accordance with the Town Law shall be entered in the minutes of the Town Board stating the effective date of the amendment, and a copy, summary or abstract thereof, exclusive of any map incorporated therein, shall be published once in the official newspaper of the Town of Poughkeepsie, and a copy, summary or abstract of such amendment, together with a copy of any map incorporated therein, shall be posted on a sign board maintained by the Town Clerk pursuant to Town Law. Affidavits of the publication shall be filed with the Town Clerk.