Update changelog

CHANGELOG.rst

@@ -1,3 +1,15 @@
+0.8.0 (2021-10-08)
+==================
+
+Features
+--------
+
+- Add ``backtrack_causes`` to ``get_preference``, which contains information
+  about the requirements involved in the most recent backtrack. This allows
+  the provider to utilise this information to tweak the ordering as well as
+  for recording/reporting conflicts.
+
+
 0.7.1 (2021-06-22)
 ==================
 
@@ -17,7 +29,7 @@ Bug Fixes
 Features
 --------
 
-- Redesign ``get_preferences()`` to include resolution state on dependencies
+- Redesign ``get_preference()`` to include resolution state on dependencies
   other than the currently working one, to allow the provider to better take
   account of the global resolver knowledge and determine the best strategy. The
   provider now can, for example, correctly calculate how far a dependency is
@@ -32,13 +44,13 @@ Features
 
 - A new argument ``incompatibilities`` is now passed to the ``find_matches()``
   hook, which the provider must use to exclude matches from the return value.  `#68 <https://github.com/sarugaku/resolvelib/issues/68>`_
-  
+
 - Redesign ``find_matches()`` to include resolution state on dependencies other
   than the currently working one, to handle usages that need to return candidates
   based on non-local states. One such example is PEP 508 direct URLs specified
   on a package, which need to be available to the same package specified with
   extras (which would have a different identifier).  `#74 <https://github.com/sarugaku/resolvelib/issues/74>`_
-  
+
 
 Bug Fixes
 ---------