update gitignore
update gitignore

mik4el/gadget_board,mik4el/gadget_board,mik4el/gadget-board,mik4el/gadget-board,mik4el/gadget_board,mik4el/gadget_board,mik4el/gadget-board,mik4el/gadget-board,mik4el/gadget_board,mik4el/gadget-board