release.rst in embulk-0.6.8

- old
+ new

@@ -2,9 +2,10 @@
 ==================================
 
 .. toctree::
     :maxdepth: 1
 
+    release/release-0.6.8
     release/release-0.6.7
     release/release-0.6.6
     release/release-0.6.5
     release/release-0.6.4
     release/release-0.6.3