Linter

```
golangci-lint run
Error: can't load config: unsupported version of the configuration: "" See https://golangci-lint.run/product/migration-guide for migration instructions
The command is terminated due to an error: can't load config: unsupported version of the configuration: "" See https://golangci-lint.run/product/migration-guide for migration instructions
make: *** [lint] Error 3
```