docs(README): add ManaCube as contributor #3430

Job	Run time
Static analysis	1m 30s
Static analysis	1m 30s
Build (x86_64-unknown-linux-gnu)	1h 0m 4s
Build (x86_64-unknown-linux-gnu)	7m 16s
Build (x86_64-unknown-linux-musl)	7m 0s
Build (x86_64-unknown-linux-musl)	7m 0s
Build (x86_64-pc-windows-gnu)	9m 1s
Build (x86_64-pc-windows-gnu)	9m 1s
Build (aarch64-unknown-linux-gnu)	6m 20s
Build (aarch64-unknown-linux-gnu)	6m 20s
Build (aarch64-unknown-linux-musl)	6m 26s
Build (aarch64-unknown-linux-musl)	6m 26s
Build (x86_64-apple-darwin)	17m 7s
Build (x86_64-apple-darwin)	17m 7s
Build (aarch64-apple-darwin)	8m 3s
Build (aarch64-apple-darwin)	8m 3s
Build universal macOS binaries	0s
Build universal macOS binaries	17s
Run and upload benchmarks	0s
Run and upload benchmarks	9m 26s
Build Docker images	0s
Build Docker images	30s
	3h 8m 27s

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