userguide/install: add rust, python-yaml to ubuntu

doc/userguide/install.rst

@@ -97,7 +97,8 @@ Recommended::
     apt-get install libpcre3 libpcre3-dbg libpcre3-dev build-essential libpcap-dev   \
                     libnet1-dev libyaml-0-2 libyaml-dev pkg-config zlib1g zlib1g-dev \
                     libcap-ng-dev libcap-ng0 make libmagic-dev libjansson-dev        \
-                    libnss3-dev libgeoip-dev liblua5.1-dev libhiredis-dev libevent-dev
+                    libnss3-dev libgeoip-dev liblua5.1-dev libhiredis-dev libevent-dev \
+                    python-yaml rustc cargo
 
 Extra for iptables/nftables IPS integration::
 
@@ -105,7 +106,7 @@ Extra for iptables/nftables IPS integration::
                     libnetfilter-log-dev libnetfilter-log1      \
                     libnfnetlink-dev libnfnetlink0
 
-For Rust support (Ubuntu only)::
+For Rust support::
 
     apt-get install rustc cargo