add changelog file

CHANGELOG.md

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+# Changelog
+
+Notable changes to the esqueue project. Pay attention to `[BREAKING]` changes when upgrading.
+
+## v0.3.2
+
+- Misisng indiced returns empty array (fixed errors in v0.3.1)
+
+## v0.3.1
+
+- Ignore missing indices when looking for jobs
+
+## v0.3.0
+
+- [BREAKING] Use `jobtype` field to control document indexing and lookup (instead of document `_type`)
+
+## v0.2.2
+
+- Swollow errors when saving job output
+- Set `process_expiration` value (prevents upstream Elasticsearch error in alpha builds)
+- Update npm package
+
+## v0.2.1
+
+- Use `esqueue` namespace for debugging
+
+## v0.2.0
+
+- [BREAKING] Async jobs should return promises, not use callbacks
+- Remove bluebird dependency
+- Only require specific lodash modules, instead of the whole library
+
+## v0.1.0
+
+- Initial release