Add vim option select to shell profile

sh/.profile

@@ -19,8 +19,13 @@ export LANG="en_US.UTF-8"
 export LC_COLLATE="C"
 
 # Export editor preferences.
-export EDITOR="vim"
-export VISUAL="vim"
+if which nvim &> /dev/null; then
+  export PREFERRED_VIM=nvim
+else
+  export PREFERRED_VIM=vim
+fi
+export EDITOR="$PREFERRED_VIM"
+export VISUAL="$PREFERRED_VIM"
 
 # Export browser preferences.
 export BROWSER="firefox"