fix update script

nvim_update.sh

@@ -1,12 +1,10 @@
-#!/usr/bin/env bash
-
 TMP_DIR="tmp_nvim"
 mkdir -p ${TMP_DIR}
 
 # Download latest nightly release of Neovim
-curl -L https://github.com/neovim/neovim/releases/download/nightly/nvim-linux64.tar.gz | \
-  sudo tar -d ${TMP_DIR} -xzf /dev/stdin
+wget --output-document=/dev/stdout https://github.com/neovim/neovim/releases/download/nightly/nvim-linux64.tar.gz | \
+  tar --directory ${TMP_DIR} -xzf /dev/stdin
 
-rm -rf ~/neovim
+sudo rm -rf ~/neovim
 sudo mv ${TMP_DIR}/nvim-linux64 ~/neovim