Add changelog items

changelog/unreleased/jwt-secret-config

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+Enhancement: Make jwt secret configurable
+
+We added a config option for the reva token manager JWTSecret. It was hardcoded before and is now configurable.
+
+https://github.com/owncloud/ocis-proxy/pull/41

changelog/unreleased/token-header-fix

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+Bugfix: Fix x-access-token in header
+
+We fixed setting the x-access-token in the request header, which was broken before.
+
+https://github.com/owncloud/ocis-proxy/pull/41