README: Change `scrooloose/nerdtree` to `preservim/nerdtree` (#1226)

Co-authored-by: Junegunn Choi <junegunn.c@gmail.com>

README.md

@@ -117,7 +117,7 @@ Plug 'https://github.com/junegunn/vim-github-dashboard.git'
 Plug 'SirVer/ultisnips' | Plug 'honza/vim-snippets'
 
 " On-demand loading
-Plug 'scrooloose/nerdtree', { 'on':  'NERDTreeToggle' }
+Plug 'preservim/nerdtree', { 'on': 'NERDTreeToggle' }
 Plug 'tpope/vim-fireplace', { 'for': 'clojure' }
 
 " Using a non-default branch

doc/plug.txt

@@ -1,4 +1,4 @@
-plug.txt	plug	Last change: January 3 2022
+plug.txt	plug	Last change: January 19 2023
 PLUG - TABLE OF CONTENTS                                         *plug* *plug-toc*
 ==============================================================================
 
@@ -153,7 +153,7 @@ Example~
     Plug 'SirVer/ultisnips' | Plug 'honza/vim-snippets'
 
     " On-demand loading
-    Plug 'scrooloose/nerdtree', { 'on':  'NERDTreeToggle' }
+    Plug 'preservim/nerdtree', { 'on': 'NERDTreeToggle' }
     Plug 'tpope/vim-fireplace', { 'for': 'clojure' }
 
     " Using a non-default branch
@@ -264,7 +264,7 @@ Reload .vimrc and `:PlugInstall` to install plugins.
                                              *plug-on-demand-loading-of-plugins*
 >
     " NERD tree will be loaded on the first invocation of NERDTreeToggle command
-    Plug 'scrooloose/nerdtree', { 'on': 'NERDTreeToggle' }
+    Plug 'preservim/nerdtree', { 'on': 'NERDTreeToggle' }
 
     " Multiple commands
     Plug 'junegunn/vim-github-dashboard', { 'on': ['GHDashboard', 'GHActivity'] }

plug.vim

@@ -22,7 +22,7 @@
 "   Plug 'SirVer/ultisnips' | Plug 'honza/vim-snippets'
 "
 "   " On-demand loading
-"   Plug 'scrooloose/nerdtree', { 'on':  'NERDTreeToggle' }
+"   Plug 'preservim/nerdtree', { 'on': 'NERDTreeToggle' }
 "   Plug 'tpope/vim-fireplace', { 'for': 'clojure' }
 "
 "   " Using a non-default branch