Allow PHP 8 for the upcoming 3.0 (#275)

* bump version to allow php 8

* allow php 8 in travis

* add scrutinizer config

.scrutinizer.yml

@@ -0,0 +1,13 @@
+imports:
+    - php
+
+build:
+    environment:
+        php: '7.2.13'
+    tests:
+        override:
+            -
+                command: 'vendor/bin/phpunit --coverage-clover=clover.xml'
+                coverage:
+                    file: 'clover.xml'
+                    format: 'clover'

.travis.yml

@@ -14,6 +14,10 @@ matrix:
       env:
         - psalm=yes
       dist: bionic
+    - php: 8.0
+      env:
+        - psalm=yes
+      dist: bionic
 
 install:
   - if [ "$deps" = "low" ]; then composer update --prefer-lowest; else composer install; fi

composer.json

@@ -19,9 +19,9 @@
   },
   "require-dev": {
     "php-coveralls/php-coveralls": "^2.2",
-    "phpunit/phpunit": "^8",
+    "phpunit/phpunit": "^8.5.8|^9.3.3",
     "dominicsayers/isemail": "^3.0.7",
-    "vimeo/psalm": "^3.11"
+    "vimeo/psalm": "^4"
   },
   "suggest": {
     "ext-intl": "PHP Internationalization Libraries are required to use the SpoofChecking validation"