Fix for recent rename of `master` branch to `main` #202

Job	Run time
Check wasm32	1m 13s
Check	2m 10s
Clippy	2m 7s
build (macos-latest, aarch64-apple-darwin)	6m 37s
Rustfmt	21s
build (macos-latest, x86_64-apple-darwin)	5m 34s
Test Suite	5m 6s
trunk	1m 42s
build (ubuntu-latest, arm-unknown-linux-musleabihf)	3m 51s
build (ubuntu-latest, armv7-unknown-linux-musleabihf)	3m 55s
build (ubuntu-latest, x86_64-unknown-linux-musl)	3m 49s
build (windows-latest, x86_64-pc-windows-msvc, .exe)	3m 32s
	39m 57s

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