fix copy&paste error in readme

- also add oil to completion command

README.md

@@ -124,7 +124,7 @@ eval (lab completion|slurp)
 lab completion | source
 
 # oil
-source <(gh _carapace)
+source <(lab completion)
 
 # powershell (~/.config/powershell/Microsoft.PowerShell_profile.ps1)
 Set-PSReadlineKeyHandler -Key Tab -Function MenuComplete

cmd/completion.go

@@ -11,17 +11,18 @@ import (
 // completionCmd represents the completion command
 var completionCmd = &cobra.Command{
 	Use:   "completion [shell]",
-	Short: "Generates the shell autocompletion [bash, elvish, fish, powershell, xonsh, zsh]",
-	Long: `Generates the shell autocompletion [bash, elvish, fish, powershell, xonsh, zsh]
+	Short: "Generates the shell autocompletion [bash, elvish, fish, oil, powershell, xonsh, zsh]",
+	Long: `Generates the shell autocompletion [bash, elvish, fish, oil, powershell, xonsh, zsh]
 
 Scripts can be directly sourced (though using pre-generated versions is recommended to avoid shell startup delay):
   bash       : source <(lab completion)
   elvish     : eval(lab completion|slurp)
-  fish       : lab completion fish | source
+  fish       : lab completion | source
+  oil        : source <(lab completion)
   powershell : lab completion | Out-String | Invoke-Expression
   xonsh      : exec($(lab completion))
   zsh        : source <(lab completion)`,
-	ValidArgs: []string{"bash", "elvish", "fish", "powershell", "xonsh", "zsh"},
+	ValidArgs: []string{"bash", "elvish", "fish", "oil", "powershell", "xonsh", "zsh"},
 	Run: func(cmd *cobra.Command, args []string) {
 		shell := ""
 		if len(args) > 0 {