Add package suggestions for fast-excel and snappy pdf.

Author: yajra

composer.json

@@ -25,6 +25,10 @@
     "mockery/mockery": "~1.0",
     "phpunit/phpunit": "~7.0"
   },
+  "suggest": {
+    "rap2hpoutre/fast-excel": "Faster exporting of dataTables using fast-excel package.",
+    "barryvdh/laravel-snappy": "For exporting of dataTables to PDF."
+  },
   "autoload": {
     "psr-4": {
       "Yajra\\DataTables\\": "src/"