updated landing page link in README

Author: blakeboswell

README.md

@@ -3,6 +3,6 @@ Argo is a Monte Carlo simulation add-in for Microsoft Excel. Developed by [Booz
 
 ## Resources
 
-- [Argo Landing Page](boozallen.github.io/argo): download link and general information about Argo
+- [Argo Landing Page](https://boozallen.github.io/argo): download link and general information about Argo
 - [Argo Wiki](https://github.com/boozallen/argo/wiki): user documentation
 - [Argo User Google Group](https://groups.google.com/forum/#!forum/argo-users): user group monitored by development team and expert users