[HOTFIX] missing dependency illuminate str (#263)

* Require illuminate/support as direct dependency

* Add travis task to test phpinsight against himself without dev-dependencies

* Revert "Require illuminate/support as direct dependency"

This reverts commit ee511bd.

* Remove Support\Str usage in SniffDecorator

.travis.yml

@@ -26,7 +26,9 @@ script:
       composer run phpunit:test
       composer run insights -- --disable-security-check
     fi
-
+  - rm -rf vendor/
+  - composer install --no-dev
+  - composer run insights -- --disable-security-check
 jobs:
   include:
     - stage: build docker image

src/Domain/Insights/SniffDecorator.php

@@ -4,7 +4,6 @@
 
 namespace NunoMaduro\PhpInsights\Domain\Insights;
 
-use Illuminate\Support\Str;
 use NunoMaduro\PhpInsights\Domain\Contracts\HasDetails;
 use NunoMaduro\PhpInsights\Domain\Contracts\Insight;
 use NunoMaduro\PhpInsights\Domain\Details;
@@ -123,11 +122,11 @@ public function getTitle(): string
         $path = explode('\\', $sniffClass);
         $name = (string) array_pop($path);
 
-        $name = Str::before($name, 'Sniff');
+        $name = str_replace('Sniff', '', $name);
 
-        return Str::ucfirst(
-            trim(
-                Str::lower(
+        return ucfirst(
+            mb_strtolower(
+                trim(
                     (string) preg_replace(
                         '/(?<!\ )[A-Z]/',
                         ' $0',