Add note re Go 1.3+ requirement

README.md

@@ -6,6 +6,8 @@ rqlite [![Circle CI](https://circleci.com/gh/otoolep/rqlite/tree/master.svg?styl
 *rqlite* is a distributed system that provides a replicated SQLite database. rqlite is written in [Go](http://golang.org/) and uses [Raft](http://raftconsensus.github.io/) to achieve consensus across all the instances of the SQLite databases. rqlite ensures that every change made to the database is made to a majority of underlying SQLite files, or none-at-all.
 
 ## Building and Running
+*Building rqlite requires Go 1.3 or later. [gvm](https://github.com/moovweb/gvm) is a great tool for managing your version of Go.*
+
 Download, test (optional), and run rqlite like so (tested on 64-bit Kubuntu 14.04):
 
     mkdir rqlite # Or any directory of your choice.