bugfix #142 Remove "syntaxCheck" config for PHPUnit (phansys)

This PR was merged into the master branch.

Discussion
----------

|Q            |A     |
|---          |---   |
|Branch       |master|
|Bug fix?     |yes   |
|New feature? |no    |
|BC breaks?   |no    |
|Deprecations?|no    |
|Tests pass?  |yes   |
|Fixed tickets|n/a   |
|License      |MIT   |
|Doc PR       |n/a   |

Fixes this warning:
```
PHPUnit 7.4.5 by Sebastian Bergmann and contributors.

  Warning - The configuration file did not pass validation!
  The following problems have been detected:

  Line 13:
  - Element 'phpunit', attribute 'syntaxCheck': The attribute 'syntaxCheck' is not allowed.
```

Commits
-------

8b45789 Remove "syntaxCheck" config for PHPUnit

Author: phansys

phpunit.xml.dist

@@ -8,7 +8,6 @@
          convertWarningsToExceptions="true"
          processIsolation="false"
          stopOnFailure="false"
-         syntaxCheck="false"
          bootstrap="Tests/bootstrap.php"
 >
     <php>