Update changes file

CHANGES

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 HikariCP Changes
 
+Changes between 1.3.0 and 1.3.1
+
+ *) Java 6 compatibility.
+
+ *) Added Sybase-specific disconnect error codes to SQLException snooping.
+
+ *) Added HikariConfig.setCatalog() method to set DataSource catalog.
+
+ *) Add DataSource.close() method that is synonymous  with shutdown().
+
+ *) More performance improvements (never ending).
+
+ *) Moved benchmarks to https://github.com/brettwooldridge/HikariCP-benchmark
+
 Changes between 1.2.9 and 1.3.0
 
  *) Pool is now backed by a custom lock-less ConcurrentBag that