Vim: add .swo and .swn for swap files #146

Job	Run time
Extract crate metadata	2s
Ensure 'cargo fmt' has been run	6s
Minimum supported rust version	24s
aarch64-unknown-linux-gnu (ubuntu-20.04)	1m 22s
arm-unknown-linux-gnueabihf (ubuntu-20.04)	1m 21s
arm-unknown-linux-musleabihf (ubuntu-20.04)	1m 15s
i686-pc-windows-msvc (windows-2019)	2m 37s
i686-unknown-linux-gnu (ubuntu-20.04)	1m 0s
i686-unknown-linux-musl (ubuntu-20.04)	1m 31s
x86_64-apple-darwin (macos-13)	1m 1s
aarch64-apple-darwin (macos-15)	50s
x86_64-pc-windows-gnu (windows-2019)	1m 31s
x86_64-pc-windows-msvc (windows-2019)	2m 47s
x86_64-unknown-linux-gnu (ubuntu-20.04)	51s
x86_64-unknown-linux-musl (ubuntu-20.04)	59s
	17m 37s

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