Update travis

Author: filipsedivy

.travis.yml

@@ -4,9 +4,11 @@ env:
 
 language: php
 php:
-  - '7.1'
-  - '7.2'
-  - '7.3'
+  - 7.1
+  - 7.2
+  - 7.3
+  - 7.4snapshot
+  - nightly
 
 sudo: false
 cache:
@@ -51,6 +53,8 @@ jobs:
     - stage: Static Analysis
     - stage: Code Coverage
     - stage: Code Sniffer
+    - php: 7.4snapshot
+    - php: nightly
 
 notifications:
   email: false

composer.json

@@ -23,7 +23,7 @@
         }
     ],
     "require": {
-        "php": "^7.1",
+        "php": "^7.3",
         "ext-curl": "*",
         "ext-dom": "*",
         "ext-openssl": "*",
@@ -46,6 +46,9 @@
     "minimum-stability": "dev",
     "prefer-stable": true,
     "config": {
-        "sort-packages": true
+        "sort-packages": true,
+        "platform": {
+            "php": "7.3"
+        }
     }
 }