Add current changelog for 5.0.0 (extracted from #570)

Since stable-4.1 only has backports, all its changes also apply to the
latest version and do not need to be repeated in 5.0.0

CHANGELOG.rst

@@ -6,8 +6,37 @@ This document describes changes between each past release.
 5.0.0 (unreleased)
 ==================
 
+Breaking changes
+----------------
+
+- Drop support for Python 2 (#483)
+- Drop support for Python 3.5 (#571)
+
+The minimum supported version is now Python 3.6
+
+Added
+-----
+
+- Allow to import previously exported json data (#518)
+- Add new optional field "external link" in bill form (#429)
+- Add currencies to project and bills (#541)
+- Add new statistics showing monthly expenses (#526)
+- Add pagination to the list of bills (#480)
+- Add sorting, pagination, and searching to the admin dashboard (#538)
+- Add Project History page that records all changes (#553)
+- Add token-based authentication to the API (#504)
+
+Changed
+-------
+
 - Use the external debts lib to solve settlements (#476)
 - Remove balance column in statistics view (#323)
+- Make language choice persistent (#547)
+
+Fixed
+-----
+
+- Improve input of email addresses when inviting people to join a project (#133)
 
 4.1.4 (2020-06-07)
 ==================