[readme] update cdnvm implementation

README.md

@@ -503,17 +503,9 @@ If you prefer a lighter-weight solution, the recipes below have been contributed
 Put the following at the end of your `$HOME/.bashrc`:
 
 ```bash
-find-up() {
- path=$(pwd)
- while [[ "$path" != "" && ! -e "$path/$1" ]]; do
- path=${path%/*}
- done
- echo "$path"
-}
-
 cdnvm() {
  cd "$@";
- nvm_path=$(find-up .nvmrc | tr -d '\n')
+ nvm_path=$(nvm_find_up .nvmrc | tr -d '\n')
 
  # If there are no .nvmrc file, use the default nvm version
  if [[ ! $nvm_path = *[^[:space:]]* ]]; then