Bump NUnit from 4.2.1 to 4.2.2 in /src#581

dependabot[bot] merged 1 commit intomainVerifyTests/Verify.ImageSharp:mainfrom

dependabot/nuget/src/NUnit-4.2.2VerifyTests/Verify.ImageSharp:dependabot/nuget/src/NUnit-4.2.2Copy head branch name to clipboard