docs updated

Author: barseghyanartur

CHANGELOG.rst

@@ -17,7 +17,7 @@ are used for versioning (schema follows below):
 
 0.8
 ---
-2018-mm-dd (not yet released)
+2018-06-01
 
 .. note::
 

README.rst

@@ -51,6 +51,7 @@ Main features and highlights
 - :doc:`Faceted search filter backend <advanced_usage_examples>`.
 - :doc:`Highlight backend <advanced_usage_examples>`.
 - :doc:`Suggester filter backend <advanced_usage_examples>`.
+- :doc:`Functional suggester filter backend <advanced_usage_examples>`.
 - :doc:`Pagination (Page number and limit/offset pagination) <advanced_usage_examples>`.
 - :doc:`Ids filter backend <advanced_usage_examples>`.