Merge remote-tracking branch 'upstream/master'

Author: Jacek Glogosz

.travis.yml

@@ -2,7 +2,6 @@ sudo: false
 language: php
 
 php:
-  - 5.3
   - 5.4
   - 5.5
   - 5.6
@@ -12,7 +11,9 @@ env:
 
 matrix:
   include:
-    - php: 7.0
+    - php: 5.3
+      dist: precise
+    - php: 7.1
       env: ADAPTER_VERSION="^1.0.0" MONGODB_VERSION=stable
 
 services: mongodb
@@ -25,4 +26,4 @@ before_script:
   - composer install --dev
 
 script:
-  - ./vendor/bin/phpunit
+  - ./vendor/bin/phpunit