Version bump: 3.0.0

Author: geoffharcourt

README.md

@@ -59,10 +59,13 @@ Push your local development database backup up to staging:
 
     staging restore development
 
-Deploy master to production:
+Deploy master to production (note that prior versions of Parity would run
+database migrations, that's now better handled using [Heroku release phase]):
 
     production deploy
 
+[Heroku release phase]: https://devcenter.heroku.com/articles/release-phase
+
 Deploy the current branch to staging:
 
     staging deploy

lib/parity/version.rb

@@ -1,3 +1,3 @@
 module Parity
-  VERSION = "2.4.0".freeze
+  VERSION = "3.0.0".freeze
 end