Fix license file name and add RuboCop badge #146

Job	Run time
Ruby specs (3.0, am_7.0, stable)	24s
Ruby specs (3.0, am_7.1, stable)	23s
Ruby specs (3.1, am_7.0, stable)	19s
Ruby specs (3.1, am_7.1, stable)	20s
Ruby specs (3.1, am_7.2, stable)	20s
Ruby specs (3.2, am_7.0, stable)	25s
Ruby specs (3.2, am_7.1, stable)	26s
Ruby specs (3.2, am_7.2, stable)	24s
Ruby specs (3.2, am_8.0, stable)	20s
Ruby specs (3.3, am_7.0, stable)	21s
Ruby specs (3.3, am_7.1, stable)	24s
Ruby specs (3.3, am_7.2, stable)	24s
Ruby specs (3.3, am_8.0, stable)	24s
Ruby specs (3.4, am_7.1, stable)	20s
Ruby specs (3.4, am_7.2, stable)	23s
Ruby specs (3.4, am_8.0, stable)	18s
Ruby specs (3.2, am_edge, experimental)	25s
Ruby specs (3.3, am_edge, experimental)	26s
Ruby specs (3.4, am_edge, experimental)	22s
Ruby specs (head, am_7.1, experimental)	23s
Ruby specs (head, am_7.2, experimental)	24s
Ruby specs (head, am_8.0, experimental)	20s
Ruby specs (head, am_edge, experimental)	26s
	8m 41s

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