chore: update dependencies

src/main.rs

@@ -1,5 +1,3 @@
-use std::convert::TryInto;
-
 use anyhow::Result;
 use clap::{crate_authors, crate_description, crate_name, crate_version, App, Arg};
 use gb::emu::{Emulator, CYCLES_IN_FRAME};

src/ppu.rs

@@ -4,7 +4,6 @@ use crate::GB_HEIGHT;
 use crate::GB_WIDTH;
 use dma::DirectMemoryAccess;
 use std::collections::VecDeque;
-use std::convert::TryInto;
 pub(crate) use types::PpuMode;
 use types::{
     BackgroundPalette, GrayShade, LCDControl, LCDStatus, ObjectFlags, ObjectPalette,