Test against PHP 7.2

Install `mcrypt` from PECL

.travis.yml

@@ -10,6 +10,7 @@ php:
   - 5.6
   - 7.0
   - 7.1
+  - 7.2
 
 env:
   matrix:
@@ -38,6 +39,9 @@ matrix:
     - php: 7.1
       env: DB=mysql PHPUNIT=5.7.19
 
+    - php: 7.2
+      env: DB=mysql PHPUNIT=5.7.19
+
 
 before_script:
   - composer require "phpunit/phpunit=$PHPUNIT"
@@ -52,6 +56,7 @@ before_script:
   - sh -c "if [ '$DB' = 'pgsql' ]; then psql -c 'CREATE SCHEMA test3;' -U postgres -d cakephp_test; fi"
   - chmod -R 777 ./app/tmp
   - if [[ ${TRAVIS_PHP_VERSION:0:3} == "5.3" ]] ; then pecl install timezonedb ; fi
+  - if [[ ${TRAVIS_PHP_VERSION:0:3} == "7.2" ]] ; then pecl install mcrypt ; fi
   - sh -c "if [ '$PHPCS' = '1' ]; then composer require 'cakephp/cakephp-codesniffer:1.*'; fi"
   - sh -c "if [ '$PHPCS' = '1' ]; then vendors/bin/phpcs --config-set installed_paths vendors/cakephp/cakephp-codesniffer; fi"
   - echo "extension = memcached.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini