Fix lexer in PrintYaml

Prior to this commit, the lexer was set incorrectly to json in the
PrintYaml method. This lead to broken colourization of the config when
printing as yaml.

internal/pkg/configuration/configuration.go

@@ -93,7 +93,7 @@ func (c *configuration) PrintYAML(noColor bool, writer io.Writer) error {
 
  opts := writeOptions{
  data: string(y),
- lexerName: "json",
+ lexerName: "yaml",
  noColor: noColor,
  writer: writer,
  }