Change license to EUPL #368

Job	Run time
Tests (x86_64-unknown-linux-musl, stable)	5m 17s
Tests (x86_64-pc-windows-msvc, stable)	9m 11s
Tests (x86_64-unknown-linux-gnu, stable)	5m 30s
Tests (aarch64-apple-darwin, stable)	5m 47s
Tests (x86_64-apple-darwin, stable)	9m 16s
Tests (aarch64-unknown-linux-gnu, stable)	4m 49s
	39m 50s

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