Support PHPUnit 4.* and 5.*

Author: marc-mabe

composer.json

@@ -28,11 +28,11 @@
         "php": "PHP>=5.4 will be required for using trait EnumSerializableTrait"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.0",
+        "phpunit/phpunit": "^4.0 || ^5.0",
         "phpbench/phpbench": "@dev",
 
         "lstrojny/functional-php": "HHVM: variadic params with type constraints are not supported in non-Hack",
-        "lstrojny/functional-php": "1.2.*|1.0.*"
+        "lstrojny/functional-php": "1.2.* || 1.0.*"
     },
     "autoload": {
         "psr-4": {