Add details about v2.2.0 and bump version #80

Job	Run time
Ruby: 3.3, Rails: 7.1, Channel: stable	56s
Ruby: 3.3, Rails: 7.2, Channel: stable	1m 1s
Ruby: 3.2, Rails: 7.0, Channel: stable	56s
Ruby: 3.2, Rails: 7.1, Channel: stable	51s
Ruby: 3.2, Rails: 7.2, Channel: stable	57s
Ruby: 3.1, Rails: 6.1, Channel: stable	58s
Ruby: 3.1, Rails: 7.0, Channel: stable	50s
Ruby: 3.1, Rails: 7.1, Channel: stable	51s
Ruby: 3.1, Rails: 7.2, Channel: stable	52s
Ruby: ruby-head, Rails: edge, Channel: experimental	57s
Ruby: ruby-head, Rails: 7.2, Channel: experimental	1m 5s
Ruby: ruby-head, Rails: 7.1, Channel: experimental	56s
Ruby: 3.3, Rails: edge, Channel: experimental	58s
Ruby: 3.2, Rails: edge, Channel: experimental	1m 1s
Ruby: 3.1, Rails: edge, Channel: experimental	1m 5s
	14m 14s

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