Allow phpunit 7.x

Ref: https://stackoverflow.com/a/44331140/5155484

Signed-off-by: William Desportes <[email protected]>

Author: williamdes

composer.json

@@ -22,7 +22,7 @@
     "require-dev": {
         "sami/sami": "^4.0",
         "phpunit/php-code-coverage": "*",
-        "phpunit/phpunit": "~4.8 || ~5.7 || ~6.5",
+        "phpunit/phpunit": "~4.8 || ~5.7 || ~6.5 || ^7.0",
         "squizlabs/php_codesniffer": "~2.9 || ~3.4"
     },
     "conflict": {

phpunit.xml.dist

@@ -9,8 +9,7 @@
          convertNoticesToExceptions="true"
          convertWarningsToExceptions="true"
          processIsolation="false"
-         stopOnFailure="false"
-         syntaxCheck="false">
+         stopOnFailure="false">
     <logging>
         <log type="coverage-clover" target="coverage.xml" />
     </logging>