Merge pull request #24 from leviy/master_composer2

Fix composer 2 compatibility

Author: christiaan

.travis.yml

@@ -5,15 +5,8 @@ branches:
 language: php
 
 php:
-  - '7.1'
   - '7.2'
 
-matrix:
-  include:
-    - name: Test with the lowest allowed versions of dependencies
-      php: '7.1'
-      install: composer update --prefer-lowest
-
 cache:
   directories:
     - $HOME/.composer/cache

composer.json

@@ -10,8 +10,8 @@
         }
     ],
     "require": {
-        "php": "^7.1",
-        "dealerdirect/phpcodesniffer-composer-installer": "^0.6.2",
+        "php": "^7.2",
+        "dealerdirect/phpcodesniffer-composer-installer": "^0.7.0",
         "escapestudios/symfony2-coding-standard": "^3.6",
         "phpmd/phpmd": "^2.6",
         "slevomat/coding-standard": "^6.0",