update version in docs

Author: mengxr

docs/_config.yml

@@ -14,7 +14,7 @@ include:
 
 # These allow the documentation to be updated with newer releases
 # of Spark and Scala.
-SPARKDL_VERSION: 1.2.0
+SPARKDL_VERSION: 1.3.0
 #SCALA_BINARY_VERSION: "2.11"
 #SCALA_VERSION: "2.11.8"
 #SPARK_ISSUE_TRACKER_URL: https://issues.apache.org/jira/browse/SPARK