added tests for CakePHP 3.7, which is no longer the latest version

Author: mirko-pagliai

.travis.yml

@@ -17,6 +17,9 @@ matrix:
     - php: 7.0
       env: COVERAGE=1
 
+    - php: 7.0
+      env: CAKEPHP_VERSION="3.7.*"
+
 services:
   - mysql
   - postgresql
@@ -27,6 +30,7 @@ addons:
 install:
   - composer self-update
   - composer install --prefer-dist --no-interaction
+  - if [[ ! -z "$CAKEPHP_VERSION" ]]; then composer require --update-with-dependencies cakephp/cakephp:${CAKEPHP_VERSION}; fi
 
 before_script:
   - mysql -e 'create database test;'