Update haraka for Plugin help

Fixed GetHooks to return the array that it creates.

This doesn't completely resolve the issue of Haraka help displaying plugin run order. Haraka installation still needs to install Plugins.md into the docs directory.

bin/haraka

@@ -228,7 +228,7 @@ const plugin_doc = [
 
 
 function getHooks () {   // see haraka/Haraka#3306
-    fs.readFileSync('docs/Plugins.md').toString()
+    return fs.readFileSync('docs/Plugins.md').toString()
         .split('## Available Hooks')[1]    // discard everything before this string
         .split('### rcpt')[0]              // discard everything after this string
         .match(/\*\s(\S+)/gm)              // grab the first word of lines starting with '* '