Add config to choose pdf package to use (dompdf, snappy)

config/report-generator.php

@@ -1,5 +1,6 @@
 <?php
 
 return [
-    'flush' => false
+    'flush' => false,
+    'pdfLibrary' => 'snappy' // snappy, dompdf
 ];

readme.md

@@ -27,7 +27,19 @@ If you are running Laravel > 5.5 that's all you need to do. If you are using Lar
     'ExcelReport' => Jimmyjs\ReportGenerator\Facades\ExcelReportFacade::class,
     'CSVReport' => Jimmyjs\ReportGenerator\Facades\CSVReportFacade::class,
 
-For more better speed on generating pdf report, I recommend you to use laravel snappy package. To using laravel snappy, you should install `wkhtmltopdf` to work with this package [(Jump to wkhtmltopdf installation)](#wkhtmltopdf-installation)
+**Optionally**, You can publish the config file (then it will be available in `config/report-generator.php`)
+
+    php artisan vendor:publish --provider="Jimmyjs\ReportGenerator\ServiceProvider"
+
+If you want to generate a pdf report, please install either dompdf / snappy pdf. 
+This package will automatically use snappy pdf. If you want to use dompdf then please change `config/report-generator.php`:
+
+    return [
+        'flush' => false,
+        'pdfLibrary' => 'dompdf'
+    ];
+
+For better speed on generating pdf report, I recommend you to use laravel snappy package. To using laravel snappy, you should install `wkhtmltopdf` to work with this package [(Jump to wkhtmltopdf installation)](#wkhtmltopdf-installation)
 
 ### Example Display PDF Code
 ```php

src/ReportMedia/PdfReport.php

@@ -2,6 +2,7 @@
 
 namespace Jimmyjs\ReportGenerator\ReportMedia;
 
+use Config;
 use Jimmyjs\ReportGenerator\ReportGenerator;
 
 class PdfReport extends ReportGenerator
@@ -28,12 +29,13 @@ public function make()
 			$html = \View::make('laravel-report-generator::general-pdf-template', compact('headers', 'columns', 'editColumns', 'showTotalColumns', 'styles', 'query', 'limit', 'groupByArr', 'orientation', 'showHeader', 'showMeta', 'applyFlush', 'showNumColumn'))->render();
 		}
 
-		try {
+		$pdfLibrary = Config::get('report-generator.pdfLibrary', 'snappy');
+		if ($pdfLibrary === 'snappy') {
 			$pdf = \App::make('snappy.pdf.wrapper');
 			$pdf->setOption('footer-font-size', 10);
 			$pdf->setOption('footer-left', 'Page [page] of [topage]');
 			$pdf->setOption('footer-right', 'Date Printed: ' . date('d M Y H:i:s'));
-		} catch (\ReflectionException $e) {
+		} else if ($pdfLibrary === 'dompdf') {
 			try {
 				$pdf = \App::make('dompdf.wrapper');
 			} catch (\ReflectionException $e) {