update help file to reflect the previous patch

* Add a doc section for the NERDTreeQuitOnOpen option.
  * Update changelog.
  * update credits.

doc/NERD_tree.txt

@@ -523,6 +523,8 @@ NERD tree. These options should be set in your vimrc.
 |NERDTreeMouseMode|             Tells the NERD tree how to handle mouse
                                 clicks.
 
+|NERDTreeQuitOnOpen|            Closes the tree window after opening a file.
+
 |NERDTreeShowFiles|             Tells the NERD tree whether to display files
                                 in the tree on startup.
 
@@ -836,6 +838,12 @@ fridge for later ;)
 ==============================================================================
 7. Changelog                                               *NERDTreeChangelog*
 
+2.12.0
+    - applied a patch from Matan Nassau to add the NERDTreeQuitOnOpen option
+      which closes the tree window after opening a file.
+    - fix to window resizing when opening a file when NERD tree is the only
+      window open
+
 2.11.0
     - changes to the 'o' mapping when opening files:
       - dont clobber "special" windows (eg taglist/quickfix/etc). This should
@@ -1100,6 +1108,7 @@ feature.
 Thanks to Yuan Jiang for suggesting the "o" mapping shouldnt clobber "special"
 windows, like taglist.
 
+Thanks to Matan Nassau for the patch to add the NERDTreeQuitOnOpen option.
 ==============================================================================
 9. License                                                   *NERDTreeLicense*