Added horizontal rules to FAQ section in readme

README.markdown

@@ -76,6 +76,7 @@ Faq
 
 Yes, install [nerdtree-git-plugin](https://github.com/Xuyuanp/nerdtree-git-plugin).
 
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 > Can I have the nerdtree on every tab automatically?
 
@@ -85,10 +86,12 @@ http://stackoverflow.com/questions/102384/using-vims-tabs-like-buffers
 
 If you are interested in this behaviour then consider [vim-nerdtree-tabs](https://github.com/jistr/vim-nerdtree-tabs)
 
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 > How can I open a NERDTree automatically when vim starts up?
 
 Stick this in your vimrc: `autocmd vimenter * NERDTree`
 
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 > How can I open a NERDTree automatically when vim starts up if no files were specified?
 
 Stick this in your vimrc:
@@ -98,22 +101,26 @@ Stick this in your vimrc:
 
 Note: Now start vim with plain `vim`, not `vim .`
 
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 > How can I map a specific key or shortcut to open NERDTree?
 
 Stick this in your vimrc to open NERDTree with `Ctrl+n` (you can set whatever key you want):
 
     map <C-n> :NERDTreeToggle<CR>
 
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 > How can I close vim if the only window left open is a NERDTree?
 
 Stick this in your vimrc:
 
     autocmd bufenter * if (winnr("$") == 1 && exists("b:NERDTree") && b:NERDTree.isTabTree()) | q | endif
 
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 > Can I have different highlighting for different file extensions?
 
 See here: https://github.com/scrooloose/nerdtree/issues/433#issuecomment-92590696
 
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 > How can I change default arrows?
 
 Use these variables in your vimrc. Note that below are default arrow symbols