Update CHANGELOG.

CHANGELOG.md

@@ -1,38 +1,5 @@
-# Changelog
+## 3.0.0 (unreleased)
 
-### Next release
+* Remove pessimistic constraint against future Rails releases.
 
-- Add `SMS#deliver_at` for scheduled delivery through Sidekiq.
-
-
-### v1.3.0 - November 18, 2014
-
-- Drop support for Ruby 1.9.
-- Log and test backends for development purposes.
-- Add `SMS#deliver_later` for asynchronous delivery through Sidekiq.
-
-
-### v1.2.0 - March 5, 2014
-
-- Global configuration for sender, price and country code.
-
-
-### v1.1.0 - February 28, 2014
-
-- Drop support for Ruby 1.9.1 and 1.9.2.
-- CoolSMS backend support.
-
-
-### v1.0.0 - February 3, 2014
-
-- Metadata, copyright and license tweaks.
-
-
-### v0.0.1 - August 27, 2013
-
-- Initial release with Sendega backend support.
-
-
-### v0.0.0 - May 8, 2013
-
-- Placeholder release to secure Ruby gem.
+Please check [master](https://github.com/hyperoslo/cellular/blob/master/CHANGELOG.md) for previous changes.