Update proconio #4
Merged
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proconio を 0.3.0 に上げ、依存しなくなった proconio_derive を再度追加します。またサンプルから #[fastout] の指定を削除します (AtCoder では出力の行数がさほど多くないことも多く、特に最初の方の問題では #[fastout] は不要と考えられるため) 。