Added Laravel 5.8 / PHP 7.3 support (#10)

* Updated composer.json to work with Laravel 5.6

* Updated PHPUnit compatibility

* Laravel 5.7 compatibility

* Laravel 5.7 support

* Fix merge

* Added PHP 7.3 travis check

* Added Laravel 5.8 support

* Fix PHPUnit void return type declaration issue

* Fix attribute warnings of newer PHPUnit

.travis.yml

@@ -3,6 +3,7 @@ language: php
 php:
   - 7.1
   - 7.2
+  - 7.3
 
 before_script:
   - travis_retry composer self-update

composer.json

@@ -16,7 +16,7 @@
     ],
     "require": {
         "php" : "~7.1",
-        "illuminate/support": "~5.5.0|~5.6.0|~5.7.0"
+        "illuminate/support": "~5.5.0|~5.6.0|~5.7.0|~5.8.0"
     },
     "require-dev": {
         "phpunit/phpunit": "~7.0"

phpunit.xml

@@ -20,6 +20,6 @@
         </whitelist>
     </filter>
     <logging>
-        <log type="coverage-html" target="tests/coverage" charset="UTF-8" yui="true" highlight="true"/>
+        <log type="coverage-html" target="tests/coverage"/>
     </logging>
 </phpunit>

tests/PageTitleTest.php

@@ -19,8 +19,10 @@ class PageTitleTest extends TestCase
 
     /**
      * Setup the testcase.
+     *
+     * @return void
      */
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();