Prepare 2.2.1

PCManticore · PCManticore · commit 2caa1b3c4e83 · 2019-03-02T12:54:26.000+01:00
diff --git a/ChangeLog b/ChangeLog
@@ -4,7 +4,7 @@ astroid's ChangeLog
 
 What's New in astroid 2.2.1?
 ============================
-Release Date: TBA
+Release Date: 2019-03-02
 
 * Make sure to infer the arguments to the `slice()` builtin
 
