Ross Barnie

Added missing changelog entries based on the merged PRs since 4.11.

Lint/SymbolConversion with string interpolation should be a Style cop

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## Is your feature request related to a problem? Please describe. The following code shows an example of a violation of the `Lint/SymbolConversion` cop: ```ruby prefix = "foo" symbol =...

Add License

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Without a license it's not clear what rights the authors, contributors or users have to copy/distribute or use the software, see https://choosealicense.com/no-permission/. If I've simply missed it please let me...