zend-session required in development

- For the v2 test runs, because zend-session is not a requirement of zend-mvc,
  but we're testing against a plugin that uses it, we need to add it as a dev
  requirement.
- For v3 runs, that means removing it.

Author: weierophinney

.travis.yml

@@ -53,7 +53,7 @@ before_install:
   - if [[ $ZEND_EVENTMANAGER_VERSION == '' ]]; then composer require --no-update "zendframework/zend-eventmanager:^3.0" ; fi
   - if [[ $ZEND_SERVICEMANAGER_VERSION != '' ]]; then composer require --dev --no-update "zendframework/zend-servicemanager:$ZEND_SERVICEMANAGER_VERSION" ; fi
   - if [[ $ZEND_SERVICEMANAGER_VERSION == '' ]]; then composer require --dev --no-update "zendframework/zend-servicemanager:^3.0.3" ; fi
-  - if [[ $ZEND_SERVICEMANAGER_VERSION == '' ]]; then composer remove --dev --no-update zendframework/zend-mvc ; fi
+  - if [[ $ZEND_SERVICEMANAGER_VERSION == '' ]]; then composer remove --dev --no-update zendframework/zend-mvc zendframework/zend-session ; fi
 
 install:
   - travis_retry composer install --no-interaction --ignore-platform-reqs

composer.json

@@ -35,6 +35,7 @@
         "zendframework/zend-paginator": "^2.5",
         "zendframework/zend-permissions-acl": "^2.6",
         "zendframework/zend-serializer": "^2.6.1",
+        "zendframework/zend-session": "^2.5",
         "zendframework/zend-servicemanager": "^2.7.5 || ^3.0.3",
         "zendframework/zend-uri": "^2.5",
         "fabpot/php-cs-fixer": "1.7.*",