v0.21.5

• FSharpLint.Console: add --version #612 #611 [@Thorium]
• gitignore: add the BenchmarkDotNet artifacts folder #619 [@Numpsy]
• CI: remove redundant .NET install #624 [@knocte]
• Add new rule AvoidSinglePipeOperator #595 [@tehraninasab]
• AvoidTooShortNames: fix false negative (generic type names) #622 [@Mersho]
• Remove recursive dependency #569 [@knocte]
• Conventions/Naming: refactoring #571 [@webwarrior-ws]