Clarified role of libevent in libwebsock (both optional)

README.md

@@ -29,6 +29,8 @@ To install it, you'll need to satisfy the following dependencies:
 are interested in Data Channels)
 * [libwebsock](https://github.com/payden/libwebsock) (only needed if
 you are interested in WebSockets support)
+* [libevent](http://libevent.org/) (only needed if you are interested in
+WebSockets support, as libwebsock makes use of it)
 * [rabbitmq-c](https://github.com/alanxz/rabbitmq-c) (only needed if
 you are interested in RabbitMQ support)
 
@@ -91,7 +93,9 @@ HTTP REST API, you'll have to install the version ```1.0.4``` manually:
 * *Note:* you may need to pass --libdir=/usr/lib64 to the configure
 script if you're installing on a x86_64 distribution.
 
-* *Note:* To correctly configure janus you must install libevent-dev (or libevent-devel) before installing libwebsock ([see also this](https://groups.google.com/forum/#!searchin/meetecho-janus/websockets/meetecho-janus/TqPNJDsUf2s/uBhlT8a4WUMJ)).
+* *Note:* as anticipated you'll need to install libevent-dev (or
+libevent-devel) before installing libwebsock
+([see here for more info](https://groups.google.com/forum/#!searchin/meetecho-janus/websockets/meetecho-janus/TqPNJDsUf2s/uBhlT8a4WUMJ)).
 
 Please notice that you have to install version ```1.0.4``` and not any
 later version. In fact, recent versions of libwebsock added support for