Update to Laravel v6

Author: samuelterra22

composer.json

@@ -1,6 +1,6 @@
 {
   "name": "samuelterra22/laravel-report-generator",
-  "description": "Rapidly Generate Simple Pdf & Excel Report on Laravel 5 (Using Barryvdh/DomPdf or Barryvdh/laravel-snappy & maatwebsite/excel)",
+  "description": "Rapidly Generate Simple Pdf & Excel Report on Laravel 6 (Using Barryvdh/DomPdf or Barryvdh/laravel-snappy & maatwebsite/excel)",
   "keywords": [
     "laravel",
     "excel",
@@ -17,9 +17,9 @@
     }
   ],
   "require": {
-    "php": ">=5.5.9",
+    "php": ">=7.1.0",
     "illuminate/support": "*",
-    "maatwebsite/excel": "~2.1.0"
+    "maatwebsite/excel": "^3.1.*"
   },
   "autoload": {
     "psr-4": {

src/ReportGenerator.php

@@ -3,6 +3,7 @@
 namespace SamuelTerra22\ReportGenerator;
 
 use Config;
+use Illuminate\Support\Str;
 
 class ReportGenerator
 {
@@ -82,7 +83,7 @@ private function mapColumns(Array $columns)
 
         foreach ($columns as $name => $data) {
             if (is_int($name)) {
-                $result[$data] = snake_case($data);
+                $result[$data] = Str::snake($data);
             } else {
                 $result[$name] = $data;
             }

src/ServiceProvider.php

@@ -3,6 +3,7 @@
 namespace SamuelTerra22\ReportGenerator;
 
 use Illuminate\Support\ServiceProvider as IlluminateServiceProvider;
+use Illuminate\Support\Str;
 use SamuelTerra22\ReportGenerator\ReportMedia\CSVReport;
 use SamuelTerra22\ReportGenerator\ReportMedia\ExcelReport;
 use SamuelTerra22\ReportGenerator\ReportMedia\PdfReport;
@@ -79,6 +80,6 @@ public function provides()
 
     protected function isLumen()
     {
-        return str_contains($this->app->version(), 'Lumen');
+        return Str::contains($this->app->version(), 'Lumen');
     }
 }