Update cobra dependency to v1.1.1

Cobra v1.1.1 brings improvements to autocompletion needed for ongoing kubectl work.

Signed-off-by: Eddie Zaneski <eddiezane@gmail.com>

vendor/github.com/spf13/cobra/doc/yaml_docs.go

@@ -37,6 +37,7 @@ type cmdDoc struct {
 	Name             string
 	Synopsis         string      `yaml:",omitempty"`
 	Description      string      `yaml:",omitempty"`
+	Usage            string      `yaml:",omitempty"`
 	Options          []cmdOption `yaml:",omitempty"`
 	InheritedOptions []cmdOption `yaml:"inherited_options,omitempty"`
 	Example          string      `yaml:",omitempty"`
@@ -98,6 +99,10 @@ func GenYamlCustom(cmd *cobra.Command, w io.Writer, linkHandler func(string) str
 	yamlDoc.Synopsis = forceMultiLine(cmd.Short)
 	yamlDoc.Description = forceMultiLine(cmd.Long)
 
+	if cmd.Runnable() {
+		yamlDoc.Usage = cmd.UseLine()
+	}
+
 	if len(cmd.Example) > 0 {
 		yamlDoc.Example = cmd.Example
 	}