Pgn reader uses older version of shakmaty which causes problems when using both in the same program

[hyperchessbot]

When using both shakmaty and pgn reader within the same program, official example for determining final position does not compile ( compiler hints at different versions of shakmaty ).

In particular san could not be converted to move. The solution was to first convert san to string, then parse this string with new version of shakmaty and convert it to move.

fn san(&mut self, san_plus: SanPlus) {
		let san_orig = san_plus.san;
		let san_str = format!("{}", san_orig);        
		let san_result:std::result::Result<San, _> = san_str.parse();
		match san_result {
			Ok(san) => {
				let move_result = san.to_move(&self.pos);
                                match move_result {
					Ok(m) => {
						self.pos.play_unchecked(&m);

[niklasf]

I am not very happy with the current state of this library (#12 / #17), but no reason not to publish a release with updated versions. Should be compatible with the latest shakmaty now.