add changelog

changelog/unreleased/data-path.md

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+Changed: New default data paths and easier configuration of the data path
+
+We've changed the default data path for our release artifacts:
+- oCIS docker images will now store all data in `/var/lib/ocis` instead in `/var/tmp/ocis`
+- binary releases will now store all data in `~/.ocis` instead of `/var/tmp/ocis`
+
+Also if you're a developer and you run oCIS from source, it will store all data in `~/.ocis` from now on.
+
+You can now easily change the data path for all extensions by setting the environment variable `OCIS_BASE_DATA_PATH`.
+
+If you want to package oCIS, you also can set the default data path at compile time, eg. by passing `-X "github.com/owncloud/ocis/ocis-pkg/config/defaults.BaseDataPathType=path" -X "github.com/owncloud/ocis/ocis-pkg/config/defaults.BaseDataPathValue=/var/lib/ocis"` to your go build step.
+
+https://github.com/owncloud/ocis/pull/2590