Update travis

.travis.yml

@@ -13,7 +13,6 @@ before_install:
   - sudo apt-get -qq install build-essential libtool make cmake cmake-data openssl libzmq3-dev
   - sudo apt-get -qq install libssl-dev libmysqlclient-dev libmysql++-dev libreadline6-dev zlib1g-dev libbz2-dev
   - sudo apt-get -qq install libboost1.55-dev libboost-thread1.55-dev libboost-filesystem1.55-dev libboost-system1.55-dev libboost-program-options1.55-dev libboost-iostreams1.55-dev libboost-regex1.55-dev
-  - sudo apt-get -qq install mysql-server
   - git config user.email "travis@build.bot" && git config user.name "Travis CI"
   - git tag -a -m "Travis build" init