Updated dependencies and travis configuration to work with legacy dependencies

Author: michalbundyra

.travis.yml

@@ -12,6 +12,7 @@ env:
   global:
     - COMPOSER_ARGS="--no-interaction"
     - COVERAGE_DEPS="satooshi/php-coveralls"
+    - LEGACY_DEPS="phpunit/phpunit"
 
 matrix:
   include:
@@ -61,10 +62,11 @@ before_install:
   - travis_retry composer self-update
 
 install:
-  - if [[ $TEST_COVERAGE == 'true' ]]; then travis_retry composer require --dev $COMPOSER_ARGS $COVERAGE_DEPS ; fi
+  - travis_retry composer install $COMPOSER_ARGS --ignore-platform-reqs
+  - if [[ $TRAVIS_PHP_VERSION =~ ^5.6 ]]; then travis_retry composer update $COMPOSER_ARGS --with-dependencies $LEGACY_DEPS ; fi
   - if [[ $DEPS == 'latest' ]]; then travis_retry composer update $COMPOSER_ARGS ; fi
   - if [[ $DEPS == 'lowest' ]]; then travis_retry composer update --prefer-lowest --prefer-stable $COMPOSER_ARGS ; fi
-  - travis_retry composer install $COMPOSER_ARGS
+  - if [[ $TEST_COVERAGE == 'true' ]]; then travis_retry composer require --dev $COMPOSER_ARGS $COVERAGE_DEPS ; fi
   - composer show
 
 script:

composer.json

@@ -9,7 +9,7 @@
         "middleware",
         "psr",
         "psr-7",
-        "zf2"
+        "zf"
     ],
     "extra": {
         "branch-alias": {
@@ -19,18 +19,18 @@
     },
     "require": {
         "php": "^5.6 || ^7.0",
-        "container-interop/container-interop": "^1.1",
-        "psr/http-message": "^1.0",
-        "zendframework/zend-expressive-helpers": "^1.1 || ^2.2 || ^3.0",
-        "zendframework/zend-expressive-router": "^1.3.2 || ^2.0",
+        "container-interop/container-interop": "^1.2",
+        "psr/http-message": "^1.0.1",
+        "zendframework/zend-expressive-helpers": "^1.4 || ^2.2 || ^3.0.1",
+        "zendframework/zend-expressive-router": "^1.3.2 || ^2.1",
         "zendframework/zend-expressive-template": "^1.0.4",
-        "zendframework/zend-servicemanager": "^2.7.5 || ^3.0.3",
+        "zendframework/zend-servicemanager": "^2.7.8 || ^3.3",
         "zendframework/zend-view": "^2.8.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.7 || ^6.0",
-        "zendframework/zend-coding-standard": "~1.0.0",
-        "malukenho/docheader": "^0.1.5"
+        "malukenho/docheader": "^0.1.5",
+        "phpunit/phpunit": "^6.0.8 || ^5.7.15",
+        "zendframework/zend-coding-standard": "~1.0.0"
     },
     "autoload": {
       "psr-4": {