chore: Add CHANGELOG.md

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [1.1.0] - 2018-10-08
+### Added
+
+- User generated content (Campaigns and Googies) is translated (Using
+  Rails i18n and globalize)
+  - Switch the language in the back-office (ActiveAdmin) while editing
+    a resource and hit save
+  - Now all content (pages and user generated content) is translated!
+
+- Introduce Rubocop for linting
+
+### Changed
+
+- Integration tests run with Firefox headless instead of Chromium
+- Upgrade from CircleCI v1 to v2
+- Upgrade to Rails 5.1.6 (latest in 5.1.x branch) and remove
+  deprecation messages
+- Goody validates presence of :title, :description