Update CHANGELOG.md (#2807)

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 # 1.8.0
 
+- performance improvements for `prefer_is_not_empty`
+- fixed false positive in `no_logic_in_create_state`
+- improve `package_names` to allow dart identifiers as package names
 - fixed false-positive in `package_names` (causing keywords to wrongly get flagged)
 - fixed `avoid_classes_with_only_static_member` to check for inherited members and also
   flag classes with only methods