Composer update

* updated Laravel to v5.6.38
* Added laravel tinker in dev dependencies

vendor/jakub-onderka/php-console-highlighter/phpunit.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit bootstrap="tests/bootstrap.php">
+    <testsuites>
+        <testsuite>
+            <directory>tests/*</directory>
+        </testsuite>
+    </testsuites>
+
+    <!-- Ignore vendor folder for code coverage -->
+    <filter>
+        <blacklist>
+            <directory>vendor</directory>
+        </blacklist>
+    </filter>
+</phpunit>