release.rst in embulk-0.6.22

- old
+ new

@@ -2,9 +2,10 @@
 ==================================
 
 .. toctree::
     :maxdepth: 1
 
+    release/release-0.6.22
     release/release-0.6.21
     release/release-0.6.20
     release/release-0.6.19
     release/release-0.6.18
     release/release-0.6.17