Add change log.

CHANGELOG.md

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+# 2.0.1 (2017-02-20)
+
+This is a bugfix release with the following changes:
+
+  * The query string is now case insensitive, as it should be.
+  * You can now search for proposals using the internal name of a
+    particular proposal status (such as `.rejected` or
+    `.acceptedWithRevisions`).
+  * You now have to insert a space between <kbd>se</kbd> and your
+    query string. Previously, the workflow also triggered for queries
+    such as <kbd>setup</kbd>, which was not a good idea.
+  * The timing of how the script is run when you modify the query
+    string has been tweaked.
+
+# 2.0.0 (2017-02-20)
+
+This third release of `alfred-swift-evolution` contains the following improvements:
+
+  * The script implementing the workflow is now written in Swift.
+  * Proposal information is now downloaded from the JSON API behind
+    the official [Swift evolution review status page][status].
+  * Alfred now displays a list of matching proposals, not just a
+    generic item for running the actual lookup.
+  * Matching proposals are now listed with their title and current
+    status.
+  * You can filter proposals by keyword or status, not just by
+    proposal number.
+
+[status]: https://apple.github.io/swift-evolution/
+
+# 1.1.0 (2016-09-26)
+
+This release updates the way proposals are retrieved to follow
+changes in the official swift-evolution repository.
+
+# 1.0.0 (2016-08-02)
+
+Initial release, written in Python.