More precise source link for trailing slash removal rule phanan#2

For the genesis and some extra explanations: laravel/laravel#3145

README.md

@@ -128,7 +128,7 @@ RewriteCond %{REQUEST_FILENAME} !-d
 RewriteCond %{REQUEST_URI} (.+)/$
 RewriteRule ^ %1 [L,R=301]
 ```
-[Source](https://stackoverflow.com/questions/21417263/htaccess-add-remove-trailing-slash-from-url)
+[Source](http://stackoverflow.com/questions/21417263/htaccess-add-remove-trailing-slash-from-url#27264788)
 
 ### Redirect a Single Page
 ``` apacheconf