Fixed travis build file

Author: minium

.travis.yml

@@ -8,7 +8,7 @@ before_install:
   - sudo apt-get update -qq
 
 install:
-  - sudo apt-get install git libmicrohttpd-dev libcurl4-openssl-dev libjsoncpp-dev libargtable2-dev
+  - sudo apt-get install git libmicrohttpd-dev libcurl4-openssl-dev libjsoncpp-dev libargtable2-dev libhiredis-dev
   - sudo apt-get install -qq gcc-4.8 g++-4.8
   - export CXX="g++-4.8"