Merge pull request #15 from bcremer/phpunit-9-compat

Update to PHPUnit 9

Author: rdohms

.travis.yml

@@ -1,7 +1,7 @@
 language: php
 php:
-    - '7.2'
     - '7.3'
+    - '7.4'
     - nightly
 
 before_script:

composer.json

@@ -3,8 +3,8 @@
     "description": "This package provides ArraySubset and related asserts once deprecated in PHPUnit 8",
     "type": "library",
     "require": {
-        "phpunit/phpunit": "^8.0",
-        "php": "^7.2"
+        "phpunit/phpunit": "^9.0",
+        "php": "^7.3"
     },
     "license": "MIT",
     "authors": [