GIFアニメーションの拡張子がundefinedになる問題を修正した #261
Merged
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GIFアニメーションとして出力された絵文字をダウンロードしたところ、ファイルがmegamoji.gifではなくmegamoji.undefinedとして出力されていました。
拡張子の付与にはBlobのtypeを利用していますが、GIFEncoderでエンコードしたものをBlobに入れるときにtypeの指定がなかったので追加しました。