added updated changelog (apache#57)

CHANGELOG.md

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+# Changelog
+
+## 2.2.0.0 (upcoming)
+
+* Connection to Elastic with TLS
+* Connection to Postgres with TLS, unified in datastore identity
+* Removed Kafka identity, unified in datastore identity
+* Removed script connection to Postgres 
+
+## 2.1.0.4 (August 17, 2017)
+
+* Spark Dispatcher retrieves Mesos Principal and Secret from Vault
+
+## 2.1.0.3 (July 26, 2017)
+
+* Fix History Server env vars
+
+
+## 2.1.0.2 (July 25, 2017)
+
+* Dynamic Authentication for History Server
+* SDN compatibility and isolation for History Server
+
+
+## 2.1.0.1 (July 18, 2017)
+
+* Refactor vault variables
+
+
+## 2.1.0.0 (July 13, 2017)
+
+* Spark-vault interactions
+* SDN compatibility and isolation
+* Kerberized access to hdfs
+* Postgress TLS connection
+* Dynamic Authentication
+* Stratio Mesos security compatibility
+* Initial Stratio Version of Spark
+* Forked from Apache Spark 2.1.0