Update README.md

Redirect users to https://github.com/databricks/spark-redshift.

Author: mengxr

README.md

@@ -1,23 +1 @@
-RedshiftInputFormat
-===
-
-Hadoop input format for Redshift tables unloaded with the ESCAPE option.
-
-Usage in Spark Core:
-```scala
-import com.github.mengxr.hadoop.input.RedshiftInputFormat
-
-val records = sc.newAPIHadoopFile(
-  path,
-  classOf[RedshiftInputFormat],
-  classOf[java.lang.Long],
-  classOf[Array[String]])
-```
-
-Usage in Spark SQL:
-```scala
-import com.github.mengxr.hadoop.input.RedshiftInputFormat._
-
-// Call redshiftFile() that returns a SchemaRDD with all string columns.
-val records: SchemaRDD = sqlContext.redshiftFile(path, Seq("name", "age"))
-```
+This project is now hosted at https://github.com/databricks/spark-redshift.