update changelog for release

Author: black-puppydog

docs/CHANGELOG.md

@@ -14,6 +14,32 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Security
 -->
 
+## [Unreleased]
+
+### Added
+
+- Support for DHT invites as generated by
+  [manyverse](https://gitlab.com/staltz/manyverse) (#1246) added by @staltz.
+  This is the headline feature of this release. DHT invites are one of the more
+  promising ways to improve the onboarding experience without a pub.
+  We invite everyone to test this feature out. Invite a friend or family member
+  to SSB, tell us how it worked, we're eager to iterate on this!
+- Show last user activity on profile pages and mouse-over popups (#1289, #1290)
+- Add [Dracula](https://draculatheme.com)-inspired theme (#1294, #1295)
+- You can now type `/profile` into the search bar to visit your own profile.
+  (#1287) Handy in combination with using `Ctrl+L` (`Cmd+L` on MacOS) to
+  activate the search bar.
+- When using `Ctrl/Cmd+Return` to publish a message, a second push of
+  `Ctrl/Cmd+Return` will now confirm the publication, while `Esc` or simply
+  `Return` (without the `Ctrl/Cmd` modifier) will cancel the publish and return
+  back to editing the message (#1286)
+
+### Fixed
+
+- Non-square profile pictures are no longer stretched/compressed in the private
+  messages tab (#1276)
+- Update locales, especially French (#1275, #1278, #1280, #1281)
+
 ## v3.17.7 - 2020-04-07
 
 ### Added