Support for PHP 8 (#41)

Author: nebc-jasonfung

.travis.yml

@@ -3,9 +3,9 @@ language: php
 sudo: false
 
 php:
-  - 7.1
-  - 7.2
   - 7.3
+  - 7.4
+  - 8.0
 
 env:
   - DEPS=normal

composer.json

@@ -10,13 +10,13 @@
         }
     ],
     "require" : {
-        "php": "^7.1",
+        "php": "^7.3 || ^8.0",
         "swiftmailer/swiftmailer": "^5.1 || ^6.0",
         "tijsverkoyen/css-to-inline-styles": "^2.1"
     },
     "require-dev" : {
         "symfony/css-selector": "^2.0.5|^3.0",
-        "phpunit/phpunit": "^7"
+        "phpunit/phpunit": "^9.3"
     },
     "autoload": {
         "psr-4": {
@@ -30,7 +30,10 @@
     },
     "config": {
         "platform": {
-            "php": "7.1.8"
+            "php": "8.0"
         }
+    },
+    "scripts": {
+        "test": "phpunit"
     }
 }