Update README for release

README.md

@@ -28,7 +28,7 @@ You may use this library in your applications with the following dependency info
 ```
 groupId: com.databricks
 artifactId: spark-redshift
-version: 0.5.1
+version: 0.5.2
 ```
 
 You will also need to provide a JDBC driver that is compatible with Redshift. Amazon recommend that you use [their driver](http://docs.aws.amazon.com/redshift/latest/mgmt/configure-jdbc-connection.html), which is distributed as a JAR that is hosted on Amazon's website. This library has also been successfully tested using the Postgres JDBC driver.