Update changelog with unreleased changes

CHANGELOG.rst

@@ -6,6 +6,19 @@ All notable changes to this project will be documented in this file.
 The format is based on `Keep a Changelog`_,
 and this project adheres to `Semantic Versioning`_.
 
+Unreleased
+----------
+
+Changed
+~~~~~~~
+
+* Rename every occurence of "social account" by "third-party account".
+
+Fixed
+~~~~~
+
+* Fix installation documentation (nginx, uWSGI).
+
 `2.0b0`_ - 2021-05-21
 ---------------------