Added zmq dependecy

Author: lucaderi

.travis.yml

@@ -1,4 +1,5 @@
 language: c++
+dist: trusty
 
 compiler:
   - clang
@@ -7,7 +8,7 @@ compiler:
 install: 
   - sudo apt-get update || true
   - sudo apt-get install build-essential
-  - sudo apt-get install libglib2.0 libxml2-dev libpcap-dev librrd-dev redis-server libsqlite3-dev libhiredis-dev libgeoip-dev libcurl4-openssl-dev git
+  - sudo apt-get install libglib2.0 libxml2-dev libpcap-dev librrd-dev redis-server libsqlite3-dev libhiredis-dev libgeoip-dev libcurl4-openssl-dev libzmq3-dev git
 
 before_script:
   - git clone https://github.com/ntop/nDPI.git; cd nDPI; ./autogen.sh; make; cd ..