Add Godot mention in README, fix repetitive language #387

Job	Run time
test-netstandard	48s
test-unity (2021.3.27f1)	3m 34s
test-unity (2022.3.2f1)	3m 42s
inspectcode	1m 32s
test-mutation-core / stryker	4m 30s
test-mutation-gherkin / stryker	3m 47s
	17m 53s

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