.travis.yml in gratan-0.3.1.beta2 vs .travis.yml in gratan-0.3.1.beta3

@@ -1,26 +1,28 @@
 sudo: true
 language: ruby
 rvm:
-  - 2.0.0
-  - 2.1
-  - 2.2
-script:
+  - 2.3
+  - 2.4
+  - 2.5
+cache:
+  - bundler
+  - apt
+env:
+  matrix:
+    - MYSQL57=0 MYSQ_PORT=14406 # MySQL 5.6
+    - MYSQL57=1 MYSQ_PORT=14407 # MySQL 5.7
+before_script:
+  - sudo service mysql stop
   - bundle install
+  - docker-compose up -d
+  - function mysql_ping { mysqladmin -u root -h 127.0.0.1 -P $MYSQ_PORT ping; }
+  - for i in {1..60}; do mysql_ping && break; sleep 1; done
+script:
   - bundle exec rake
-env:
-  - MYSQL_VERSION=5.6.27
-before_install:
-  - gem update bundler
-install:
-  - "sudo apt-get -y remove mysql-common mysql-server-5.5 mysql-server-core-5.5 mysql-client-5.5 mysql-client-core-5.5"
-  - "sudo apt-get -y autoremove"
-  - "sudo apt-get -y install libaio1"
-  - "wget -O mysql-$MYSQL_VERSION.deb http://dev.mysql.com/get/Downloads/MySQL-5.6/mysql-$MYSQL_VERSION-debian6.0-x86_64.deb/from/http://cdn.mysql.com/"
-  - "sudo dpkg -i mysql-$MYSQL_VERSION.deb"
-  - "sudo cp -f /opt/mysql/server-5.6/support-files/mysql.server /etc/init.d/mysql.server"
-  - "sudo ln -sf /opt/mysql/server-5.6/bin/* /usr/bin/"
-  - "sudo sed -i'' 's/table_cache/table_open_cache/' /etc/mysql/my.cnf"
-  - "sudo sed -i'' 's/log_slow_queries/slow_query_log/' /etc/mysql/my.cnf"
-  - "sudo sed -i'' 's/basedir[^=]\\+=.*$/basedir = \\/opt\\/mysql\\/server-5.6/' /etc/mysql/my.cnf"
-  - "sudo sed -i'' 's/^socket *=.*$/socket = \\/tmp\\/mysql.sock/' /etc/mysql/my.cnf"
-  - "sudo /etc/init.d/mysql.server start"
+services:
+  - docker
+addons:
+  apt:
+    packages:
+      - mysql-client-core-5.6
+      - mysql-client-5.6