Add changelog entry for typed-ast change plus prepare 2.2.4

Author: PCManticore

ChangeLog

@@ -2,6 +2,12 @@
 astroid's ChangeLog
 ===================
 
+What's New in astroid 2.2.4?
+============================
+Release Date: 2019-03-05
+
+* Latest `typed_ast` gets installed for all CPython versions.
+
 What's New in astroid 2.2.3?
 ============================
 Release Date: 2019-03-03

astroid/__pkginfo__.py

@@ -21,7 +21,7 @@
 
 modname = "astroid"
 
-version = "2.2.3"
+version = "2.2.4"
 numversion = tuple(int(elem) for elem in version.split(".") if elem.isdigit())
 
 extras_require = {}