Update change log

ChangeLog.md

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+## Changes Between 2.6.0 and 2.7.0
+
+### Chef 11.10 Compatibility
+
+Contributed by Virender Khatri.
+
+### Extra Slash to File Between Path Components
+
+`log_dir` now always has at least one slash, regardless of whether there
+is a trailing slash in the user-provided attribute value.
+
+GH issue: #86.
+
+Contributed by Federico Silva.
+
+### New Attribute for User Home (`$HOME`)
+
+`user_home` is a new attribute that customizes Cassandra user `$HOME` location.
+
+Contributed by Virender Khatri.
+
+### Removed JNA Recipe
+
+The JNA recipe is no longe needed.
+
+Contributed by Virender Khatri.
+
+### Default Attributes for DataStax Enterprise
+
+The cookbook now provides default node attributes specific
+to the DSE recipe.
+
+Contributed by Anton Chebotaev.
+
+
+## Changes Between 2.5.0 and 2.6.0
+
+### Ubuntu 12.04 Compatibility
+
+Contributed by Anton Chebotaev.
+
+
+## Changes Between 2.4.0 and 2.5.0
+
+### Chef-friendly Version
+
+The cookbook now uses a 3 component version that's compatible
+with Chef server (no longer uses `-pre` for dev versions).
+
+Contributed by Anton Chebotaev.
+
+### Init Script Improvements
+
+ * Added check for C* binary
+ * Added check for nodetool binary
+ * Added extra pre-steps for C* service stop: disable thrift, disable gossip, node drain
+
+Contributed by Virender Khatri.
+
+### Disabling Xss Output in Nodetool
+
+Contributed by Virender Khatri.
+
+### Cassandra 2.0.9
+
+Default Cassandra version provisioned is now `2.0.9`.
+
+Contributed by Maksim Rusan.
+
+### Corrected yum Package Release For DSC 2.0
+
+Corrects yum package release for dsc20 2.0.8.
+
+GH issue: #73.
+
+Contributed by Brent Theisen.
+
+
 ## Changes Between 2.3.0 and 2.4.0
 
 ### apt Pinning