Merge pull request #66 from greg0ire/validate-composer-json

Make sure Composer files are valid

Author: alcaeus

.travis.yml

@@ -13,6 +13,7 @@ before_install:
   - travis_retry composer self-update
 
 install:
+  - composer validate --strict
   - rm composer.lock
   - travis_retry composer update --prefer-dist
 

composer.json

@@ -15,6 +15,11 @@
             "homepage": "http://ocramius.github.com/"
         }
     ],
+    "config": {
+        "platform": {
+            "php": "7.1.27"
+        }
+    },
     "require": {
         "php": "^7.1"
     },