Update dependencies

vendor/github.com/spf13/cobra/doc/man_docs.md

@@ -1,31 +0,0 @@
-# Generating Man Pages For Your Own cobra.Command
-
-Generating man pages from a cobra command is incredibly easy. An example is as follows:
-
-```go
-package main
-
-import (
-	"log"
-
-	"github.com/spf13/cobra"
-	"github.com/spf13/cobra/doc"
-)
-
-func main() {
-	cmd := &cobra.Command{
-		Use:   "test",
-		Short: "my test program",
-	}
-	header := &doc.GenManHeader{
-		Title: "MINE",
-		Section: "3",
-	}
-	err := doc.GenManTree(cmd, header, "/tmp")
-	if err != nil {
-		log.Fatal(err)
-	}
-}
-```
-
-That will get you a man page `/tmp/test.3`