Update the README file

README.rst

@@ -42,6 +42,7 @@ Optional dependencies:
 - ``zeroconf`` (for the autodiscover mode)
 - ``netifaces`` (for the IP plugin)
 - ``influxdb`` (for the InfluxDB export module)
+- ``cassandra-driver`` (for the Cassandra export module)
 - ``statsd`` (for the StatsD export module)
 - ``pystache`` (for the action script feature)
 - ``docker-py`` (for the Docker monitoring support) [Linux-only]
@@ -108,13 +109,14 @@ features (like the Web interface, exports modules, sensors...):
 
 .. code-block:: console
 
-    pip install bottle requests batinfo https://bitbucket.org/gleb_zhulik/py3sensors/get/tip.tar.gz zeroconf netifaces pymdstat influxdb elasticsearch potsdb statsd pystache docker-py pysnmp pika py-cpuinfo bernhard cassandra scandir
+    pip install bottle requests batinfo https://bitbucket.org/gleb_zhulik/py3sensors/get/tip.tar.gz zeroconf netifaces pymdstat influxdb elasticsearch potsdb statsd pystache docker-py pysnmp pika py-cpuinfo bernhard cassandra-driver scandir
 
 To upgrade Glances to the latest version:
 
 .. code-block:: console
 
     pip install --upgrade glances
+    pip install --upgrade bottle requests batinfo https://bitbucket.org/gleb_zhulik/py3sensors/get/tip.tar.gz zeroconf netifaces pymdstat influxdb elasticsearch potsdb statsd pystache docker-py pysnmp pika py-cpuinfo bernhard cassandra-driver scandir
 
 If you need to install Glances in a specific user location, use: