Update known issues in README

Added that you can't download blocks code

Author: alan412

README.md

@@ -14,4 +14,4 @@ WARNING! This is not ready for use and is under heavy development of basic featu
 ## Known Issues
 In addition to those listed in the issues on github, there are some major pieces not ready yet.
 1. Deploy doesn't connect to backend
-1. No ability to upload blocks code
+1. No ability to download or upload blocks code