jruby: fix link

Author: noraj

module-0x4-or-web-kung-fu/extending-burp-suite.md

@@ -2,7 +2,7 @@
 
 ## Setting up the Ruby environment for Burp Extensions
 
-1. Download a stable version of JRuby from [JRuby Downloads](http://jruby.org/download)
+1. Download a stable version of JRuby from [JRuby Downloads](https://www.jruby.org/download)
 2. Select the jar for Linux \(JRuby x.x.x Complete .jar\) or Executable for Windows.
 3. Import the environment from **Burp Suite** >> **Extender** >> **Options** >> **Ruby Environment**.