Travis apt-get update for MySQL 5.5 install

Author: sodabrew

.travis.yml

@@ -13,7 +13,6 @@ addons:
   hosts:
     - mysql2gem.example.com
   apt:
-    update: true
     packages:
     - mysql-server-5.6
     - mysql-client-core-5.6

.travis_mysql55.sh

@@ -5,4 +5,5 @@ set -eux
 apt-get purge -qq '^mysql*' '^libmysql*'
 rm -fr /etc/mysql
 rm -fr /var/lib/mysql
+apt-get update -qq
 apt-get install -qq mysql-server-5.5 mysql-client-core-5.5 mysql-client-5.5 libmysqlclient-dev