Prepare changelog for 0.4.0

CHANGELOG.md

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+Changes in [0.4.0](https://github.com/vector-im/vector-web/releases/tag/v0.4.0) (2016-03-23)
+============================================================================================
+[Full Changelog](https://github.com/vector-im/vector-web/compare/v0.3.0...v0.4.0)
+
+ * Update to matrix-react-sdk 0.3.0; see
+   https://github.com/matrix-org/matrix-react-sdk/blob/master/CHANGELOG.md
+
+Other changes
+ * permalink button
+   [\#1232](https://github.com/vector-im/vector-web/pull/1232)
+ * make senderprofiles clickable
+   [\#1191](https://github.com/vector-im/vector-web/pull/1191)
+ * fix notif spam when logging in from a guest session by correctly logging out
+   first.
+   [\#1180](https://github.com/vector-im/vector-web/pull/1180)
+ * use new start_login_from_guest dispatch for cancellable logins from guest
+   accounts
+   [\#1165](https://github.com/vector-im/vector-web/pull/1165)
+ * Use then() chaining rather than manual callbacks
+   [\#1171](https://github.com/vector-im/vector-web/pull/1171)
+ * Remove trailing whitespace
+   [\#1163](https://github.com/vector-im/vector-web/pull/1163)
+ * Update the actions of default rules instead of overriding.
+   [\#1037](https://github.com/vector-im/vector-web/pull/1037)
+ * Update README to include `npm install` in react-sdk
+   [\#1137](https://github.com/vector-im/vector-web/pull/1137)
+
+Changes in vector v0.3.0 (2016-03-11)
+======================================
+ * Lots of new bug fixes and updates
+
+Changes in vector v0.2.0 (2016-02-24)
+======================================
+ * Refactor of matrix-react-sdk and vector to remove separation between views and
+   controllers
+ * Temporarily break the layering abstraction between vector and matrix-react-sdk
+   for expedience in developing vector.
+ * Vast numbers of new features, including read receipts, read-up-to markers,
+   updated look and feel, search, new room and user settings, and email invites.
+
+Changes in vector v0.1.2 (2015-10-28)
+======================================
+ * Support Room Avatars
+ * Fullscreen video calls
+ * Mute mic in VoIP calls
+ * Fix bug with multiple desktop notifications
+ * Context menu on messages
+ * Better hover-over on member list
+ * Support CAS auth
+ * Many other bug fixes
+ 
+Changes in vector v0.1.1 (2015-08-10)
+======================================
+
+ * Support logging in with an email address
+ * Use the Vector identity server
+ * Fix a bug where the client was not stopped properly on logout
+ * Fix bugs where field values would be forgotten if login or registration failed
+ * Improve URL bar navigation
+ * Add explanatory help text on advanced server options
+ * Fix a bug which caused execptions on malformed VoIP invitations
+ * Remove superfluous scrollbars on Firefox
+ * Numerous CSS fixes
+ * Improved accessibility
+ * Support command-click / middle click to open image in a new tab
+ * Improved room directory
+ * Fix display of text with many combining unicode points
+
+Changes in vector v0.1.0 (2015-08-10)
+======================================
+Initial release