funktion create --file should work!

thanks to @jcrossley3 for spotting this!
[jim@localhost blog-example]$ funktion create -h
This command will create one or more resources from the command one, a file, directory or URL

Usage:
  funktion create -f FILENAME [flags]
  funktion create [command]

Available Commands:
  flow        Creates a new flow which creates an event stream and then invokes a function or HTTP endpoint
  fn          creates a new function

Flags:
  -d, --debug               enable debugging for the function?
  -e, --env stringArray     pass one or more environment variables using the form NAME=VALUE
  -f, --file string         the file name that contains the source code for the function to create
      --kubeconfig string   the directory to look for the kubernetes configuration
      --namespace string    the namespace to create the resource
  -w, --watch               whether to keep watching the files for changes to the function source code

Use "funktion create [command] --help" for more information about a command.
[jim@localhost blog-example]$ funktion create fn --file $PWD
Error: unknown flag: --file
Usage:
  funktion create fn [flags]

Flags:
  -d, --debug               enable debugging for the function?
  -e, --env stringArray     pass one or more environment variables using the form NAME=VALUE
      --kubeconfig string   the directory to look for the kubernetes configuration
  -n, --name string         the name of the function to create
      --namespace string    the namespace to create the resource
  -r, --runtime string      the runtime to use. e.g. 'nodejs' (default "nodejs")
  -s, --source string       the source code of the function to create
  -w, --watch               whether to keep watching the files for changes to the function source code

unknown flag: --file
funktionio / funktion

funktion create --file should work! #40
