Composer update

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

vendor/jakub-onderka/php-console-highlighter/.travis.yml

@@ -0,0 +1,21 @@
+language: php
+
+php:
+  - 5.3.3
+  - 5.4
+  - 5.5
+  - 5.6
+  - 7.0
+  - hhvm
+  - hhvm-nightly
+
+matrix:
+  allowed_failures:
+    - php: 7.0
+    - php: hhvm-nightly
+
+before_script:
+  - composer install --no-interaction --prefer-source
+
+script:
+  - ant