Update README.md

README.md

@@ -1,4 +1,7 @@
 # logstash-output-jdbc
+
+**This is an old version of the plugin, for Logstash v1.5 only. It is no longer receiving backports of fixes and contains several flaws which have been addressed in the Logstash v2 compatible versions, and above. Please upgrade/see the other branches in the source repository.**
+
 This plugin is provided as an external plugin and is not part of the Logstash project.
 
 This plugin allows you to output to SQL databases, using JDBC adapters.
@@ -10,7 +13,7 @@ This plugin does not bundle any JDBC jar files, and does expect them to be in a
 particular location. Please ensure you read the 4 installation lines below.
 
 ## Versions
-  - See master branch for logstash v1.5 
+  - See v1.5 branch for logstash v1.5 
   - See v1.4 branch for logstash 1.4
 
 ## Installation