Add changelog for reva update + public shares

changelog/unreleased/public-shares.md

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+Enhancement: Add public shares service
+
+Added Public Shares service with CRUD operations and File Public Shares Manager
+
+https://github.com/owncloud/ocis-reva/issues/49
+https://github.com/owncloud/ocis-reva/pull/232
+

changelog/unreleased/update-reva-to-20200529120551.md

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+Enhancement: update reva to v0.1.1-0.20200529120551-4f2d9c85d3c9
+
+- Updated reva to v0.1.1-0.20200529120551 (#232)
+- Public Shares CRUD, File Public Shares Manager (#49, #232, reva/#681, reva/#788)
+- Disable HTTP-KeepAlives to reduce fd count (ocis/#268, reva/#787)
+- Fix trashbin listing (#229, reva/#782)
+- Create PUT wrapper for TUS uploads (reva/#770)
+- Add security access headers for ocdav requests (#66, reva/#780)
+- Add option to revad cmd to specify logging level (reva/#772)
+- New metrics package (reva/#740)
+- Remove implicit data member from memory store (reva/#774)
+- Added TUS global capabilities (#177, reva/#775)
+- Fix PROPFIND with Depth 1 for cross-storage operations (reva/#779)
+
+https://github.com/owncloud/ocis-reva/issues/49
+https://github.com/owncloud/ocis-reva/pull/232
+https://github.com/cs3org/reva/pull/787
+https://github.com/cs3org/reva/pull/681
+https://github.com/cs3org/reva/pull/788
+https://github.com/owncloud/ocis-reva/issues/229
+https://github.com/cs3org/reva/pull/782
+https://github.com/cs3org/reva/pull/770
+https://github.com/owncloud/ocis-reva/issues/66
+https://github.com/cs3org/reva/pull/780
+https://github.com/cs3org/reva/pull/772
+https://github.com/cs3org/reva/pull/740
+https://github.com/cs3org/reva/pull/774
+https://github.com/owncloud/ocis-reva/issues/177
+https://github.com/cs3org/reva/pull/775
+https://github.com/cs3org/reva/pull/779
+https://github.com/owncloud/ocis/issues/268
+