Merge branch 'v5.3' into v5.4

Author: vyuldashev

.travis.yml

@@ -3,6 +3,7 @@ language: php
 php:
   - 5.6
   - 7.0
+  - 7.1
 
 services:
   - rabbitmq
@@ -11,4 +12,4 @@ before_script:
   - composer self-update
   - composer install --no-interaction
 script:
-    - phpunit --no-coverage
+  - phpunit --no-coverage