Update README.md

Author: pckltr

README.md

@@ -13,7 +13,7 @@ Requirements
 ------------
 
 * Physical machine, cloud instance, or VPS that supports Docker (i.e. [Vultr](http://bit.ly/1HngXg0), [Digital Ocean](http://bit.ly/18AykdD), KVM or XEN based VMs) running Ubuntu 14.04 or later (*not OpenVZ containers!*)
-* At least 100 GB to store the block chain files (and always growing!)
+* At least 500 GB to store the block chain files (and always growing!)
 * At least 1 GB RAM + 2 GB swap file
 
 Recommended and tested on unadvertised (only shown within control panel) [Vultr SATA Storage 1024 MB RAM/250 GB disk instance @ $10/mo](http://bit.ly/vultrbitcoind).  Vultr also *accepts Bitcoin payments*!