Updating server dependancies. (#7246)

vendor/github.com/spf13/cobra/README.md

@@ -485,6 +485,36 @@ when the `--author` flag is not provided by user.
 
 More in [viper documentation](https://github.com/spf13/viper#working-with-flags).
 
+## Positional and Custom Arguments
+
+Validation of positional arguments can be specified using the `Args` field.
+
+The follow validators are built in:
+
+- `NoArgs` - the command will report an error if there are any positional args.
+- `ArbitraryArgs` - the command will accept any args.
+- `OnlyValidArgs` - the command will report an error if there are any positional args that are not in the ValidArgs list.
+- `MinimumNArgs(int)` - the command will report an error if there are not at least N positional args.
+- `MaximumNArgs(int)` - the command will report an error if there are more than N positional args.
+- `ExactArgs(int)` - the command will report an error if there are not exactly N positional args.
+- `RangeArgs(min, max)` - the command will report an error if the number of args is not between the minimum and maximum number of expected args.
+
+A custom validator can be provided like this:
+
+```go
+
+Args: func validColorArgs(cmd *cobra.Command, args []string) error {
+  if err := cli.RequiresMinArgs(1)(cmd, args); err != nil {
+    return err
+  }
+  if myapp.IsValidColor(args[0]) {
+     return nil
+  }
+  return fmt.Errorf("Invalid color specified: %s", args[0])
+}
+
+```
+
 ## Example
 
 In the example below, we have defined three commands. Two are at the top level