Added changleog.

CHANGELOG.md

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+# Changelog
+
+## Version 1.0-beta.1 (July 4, 2013)
+
+This is the first major release since the rewrite of the API Client. Tons of things have changed so make sure to upgrade!
+
+ * Better logging with configurable verbosity.
+ * Built-in shell that does not rely on bash, but does have lots of bash features like autocomplete and history (even reverse history search).
+ * Configuration files are now in YAML.
+ * Configuration files can be modified by using the client directly with the `--save` option.
+ * Super easy install, just download the binary and go.
+ * Download UI is now nicer with progress bars.
+ * No more deleting files randomly to get the client to behave.
+
+Let us know what you think!