Add changelog

changelog/unreleased/ocm-token-mail-meshdir.md

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+Enhancement: Pass the link to the meshdirectory service in token mail.
+
+Currently, we just forward the token and the original user's domain when
+forwarding an OCM invite token and expect the user to frame the forward invite
+URL. This PR instead passes the link to the meshdirectory service, from where
+the user can pick the provider they want to accept the invite with.
+
+https://github.com/cs3org/reva/pull/1002
+https://github.com/sciencemesh/sciencemesh/issues/139