Update changelog for v2.2.0

[skip ci]
diff --git a/docs/reference.rst b/docs/reference.rst
index d9dc961..1365739 100644
--- a/docs/reference.rst
+++ b/docs/reference.rst
@@ -9,6 +9,8 @@
 Reference
 #########
 
+.. _macros:
+
 Macros
 ======