prepare release 2.8.4 - changelog updates + version bump

Author: RonnyPfannschmidt

CHANGELOG

@@ -1,5 +1,5 @@
-2.8.4.dev
----------
+2.8.4
+-----
 
 - fix #1190: ``deprecated_call()`` now works when the deprecated
   function has been already called by another test in the same
@@ -18,6 +18,9 @@
 - fix the summary printed when no tests did run.
   Thanks Florian Bruhin for the PR.
 
+- a number of documentation modernizations wrt good practices.
+  Thanks Bruno Oliveira for the PR.
+
 2.8.3
 -----
 

_pytest/__init__.py

@@ -1,2 +1,2 @@
 #
-__version__ = '2.8.4.dev1'
+__version__ = '2.8.4'