Shopify/active_merchant — pull request #1421 by girasquid (2014-10-14 16:41:21+00:00)
Title: Add deprecation policy to README

@ntalbott @jnormore @j-mutter

Based on discussion at https://github.com/Shopify/active_merchant/pull/1419 - there wasn't a clear deprecation policy before, and this makes it explicit.