ch5: incorrect value for skip operation

[fcabjolsky]

The operation 0x5000..=0x5FFF should compare two registers. Also the pattern match could be 0x5000..=0x5FF0 as the last byte is not used by this operation.

code/ch5/ch5-cpu4/src/main.rs

Line 33 in 19c4349

0x5000..=0x5FFF => { self.se(x, y); },

One possible solution:

0x5000..=0x5FF0 => { self.se(x, self.registers[y as usize]); },