Notable Changes

• Bump license year to 2021 in golden files (#1309) @Bowbaq
• Enhance PowerShell completion with custom comp (#1208) @Luap99
• Update gopkg.in/yaml.v2 to v2.4.0: The previous breaking change in yaml.v2 v2.3.0 has been reverted, see go-yaml/yaml#670
• Documentation readability improvements (#1228 etc.) @zaataylor etc.
• Use golangci-lint: Repair warnings and errors resulting from linting (#1044) @umarcor