Add UPGRADING.md to cover the breaking changes from PR devise-two-fac…

…tor#43
pdkproitf · Sep 16, 2015 · d4797c8 · d4797c8
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+# Guide to upgrading from 1.x to 2.x
+
+Pull request #43 added a new field to protect against "shoulder-surfing" attacks. If upgrading, you'll need to add the `:consumed_timestep` column to your `Users` model.
+
+```ruby
+class AddConsumedTimestepToUsers < ActiveRecord::Migration
+  def change
+    add_column :users, :consumed_timestep, :integer
+  end
+end
+```