#85: fix _zsh_nvm_completion on macos homebrew.

zsh-nvm.plugin.zsh

@@ -74,7 +74,13 @@ _zsh_nvm_load() {
 _zsh_nvm_completion() {
 
   # Add provided nvm completion
-  [[ -r $NVM_DIR/bash_completion ]] && source $NVM_DIR/bash_completion
+  # default
+  if [[ -f "$NVM_DIR/bash_completion" ]]; then
+    source "$NVM_DIR/bash_completion"
+  # homebrew
+  elif _zsh_nvm_has brew && [[ -f "$(brew --prefix nvm)/etc/bash_completion.d/nvm" ]]; then
+    source "$(brew --prefix nvm)/etc/bash_completion.d/nvm"
+  fi
 }
 
 _zsh_nvm_lazy_load() {