nes-tetris-hard-drop-patcher-0.1.2 is not a library.
NES Tetris Hard Drop Patcher
This tool reads an ines ROM file from standard input, assumes its NES Tetris, and writes an ines ROM file to its standard output which is NES Tetris with the addition of hard drop by pressing "up" on the controller.
IPS Patch
Download the IPS patch that applies this change here.