Added to readme, bumped phpunit minimum version

Author: ralphschindler

README.md

@@ -82,6 +82,11 @@ return [
      * The directory where temporary files will be stored.
      */
     'temporary_directory_path' => storage_path('app/laravel-db-snapshots/temp'),
+
+    /*
+     * Create dump files that are gzipped
+     */
+    'compress' => false,
 ];
 ```
 
@@ -100,6 +105,13 @@ Giving your snapshot a name is optional. If you don't pass a name the current da
 php artisan snapshot:create
 ```
 
+When creating snapshots, you can optionally create compressed snapshots.  To do this either pass the `--compress` option on the command line, or set the `db-snapshots.compress` configuration option to `true`:
+
+```bash
+# Creates a snapshot named my-compressed-dump.sql.gz
+php artisan snapshot:create my-compressed-dump --compress
+```
+
 After you've made some changes to the database you can create another snapshot:
 
 ```bash

composer.json

@@ -26,7 +26,7 @@
     "require-dev": {
         "mockery/mockery": "^0.9.8",
         "orchestra/testbench": "^3.4.10",
-        "phpunit/phpunit": "^6.2 || ^7.0"
+        "phpunit/phpunit": "^6.5 || ^7.0"
     },
     "autoload": {
         "psr-4": {

src/SnapshotFactory.php

@@ -68,7 +68,7 @@ protected function getDbDumper(string $connectionName): DbDumper
         return $factory::createForConnection($connectionName);
     }
 
-    protected function createDump(string $connectionName, string $fileName, FilesystemAdapter $disk, bool $compress)
+    protected function createDump(string $connectionName, string $fileName, FilesystemAdapter $disk, bool $compress = false)
     {
         $directory = (new TemporaryDirectory(config('db-snapshots.temporary_directory_path')))->create();