fix unit tests.

Author: makasim

Diff for: pkg/enqueue/.travis.yml

@@ -15,7 +15,7 @@ cache:
 
 install:
     - composer self-update
-    - composer install --prefer-source
+    - composer install --prefer-source --ignore-platform-reqs
 
 script:
     - vendor/bin/phpunit --exclude-group=functional

Diff for: pkg/enqueue/composer.json

@@ -24,7 +24,8 @@
         "enqueue/amqp-ext": "^0.4",
         "enqueue/fs": "^0.4",
         "enqueue/test": "^0.4",
-        "enqueue/simple-client": "^0.4"
+        "enqueue/simple-client": "^0.4",
+        "empi89/php-amqp-stubs": "*@dev"
     },
     "suggest": {
         "symfony/console": "^2.8|^3 If you want to use li commands",

Diff for: pkg/simple-client/.travis.yml

@@ -15,7 +15,7 @@ cache:
 
 install:
     - composer self-update
-    - composer install --prefer-source
+    - composer install --prefer-source --ignore-platform-reqs
 
 script:
     - vendor/bin/phpunit --exclude-group=functional