Add Aseprite file extensions #139

Job	Run time
Ensure 'cargo fmt' has been run	6s
Extract crate metadata	5s
Minimum supported rust version	24s
aarch64-unknown-linux-gnu (ubuntu-20.04)	1m 11s
arm-unknown-linux-gnueabihf (ubuntu-20.04)	1m 13s
arm-unknown-linux-musleabihf (ubuntu-20.04)	1m 18s
i686-pc-windows-msvc (windows-2019)	2m 13s
i686-unknown-linux-gnu (ubuntu-20.04)	1m 2s
i686-unknown-linux-musl (ubuntu-20.04)	1m 7s
x86_64-apple-darwin (macos-12)	1m 12s
x86_64-pc-windows-gnu (windows-2019)	2m 13s
x86_64-pc-windows-msvc (windows-2019)	2m 17s
x86_64-unknown-linux-gnu (ubuntu-20.04)	53s
x86_64-unknown-linux-musl (ubuntu-20.04)	1m 3s
	16m 17s

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