bumped spark version in the readme to 2.1.0

pyspark-notebook/README.md

@@ -7,7 +7,7 @@
 * Jupyter Notebook 4.3.x
 * Conda Python 3.x and Python 2.7.x environments
 * pyspark, pandas, matplotlib, scipy, seaborn, scikit-learn pre-installed
-* Spark 2.0.2 with Hadoop 2.7 for use in local mode or to connect to a cluster of Spark workers
+* Spark 2.1.0 with Hadoop 2.7 for use in local mode or to connect to a cluster of Spark workers
 * Mesos client 0.25 binary that can communicate with a Mesos master
 * Unprivileged user `jovyan` (uid=1000, configurable, see options) in group `users` (gid=100) with ownership over `/home/jovyan` and `/opt/conda`
 * [tini](https://github.com/krallin/tini) as the container entrypoint and [start-notebook.sh](../base-notebook/start-notebook.sh) as the default command