update readme

Author: Quicksaver

Readme.txt

@@ -1,3 +1,5 @@
 A port of AutoPager 0.8.0.8 by Wind Li (https://addons.mozilla.org/en-US/firefox/addon/autopager/), with compatibility fixes by me for firefox 26 and above.
 
 Some day I might actually port this into my add-on backbone... Hmm...
+
+For now, you can download the custom installer at https://github.com/Quicksaver/AutoPager/releases/tag/0.8.0.8.1 and drag and drop into your browser to install.