Update image.dart

lib/src/image.dart

@@ -1,17 +1,20 @@
+import 'dart:math';
+
 class Image {
   const Image();
 
   /// Generates a url to a image random image. The size of image is determined
   /// by `width` and `height` parameters. You can choose the image categories related
-  /// by the `keywords` parameter separeted by comma .
+  /// by the `keywords` parameter separeted by comma . By supplying the `random` parameter
+  /// you can ensure a different image is returned with the same parameters. 
   ///
   /// Example:
   /// ```dart
-  ///   faker.image.image(width: 1200, height: 900, keywords: ['people', 'nature']);
+  ///   faker.image.image(width: 1200, height: 900, keywords: ['people', 'nature'], random: true);
   /// ```
   String image(
-      {int width = 640, int height = 480, List<String> keywords = const []}) {
-    return _imageUrl(width, height, keywords);
+      {int width = 640, int height = 480, List<String> keywords = const [], bool random = false}) {
+    return _imageUrl(width, height, keywords, random);
   }
 
   /// Build a url to a image random image from unsplash
@@ -20,7 +23,7 @@ class Image {
   /// ```dart
   ///   this._imageUrl(1600, 1200,  ['people']);
   /// ```
-  String _imageUrl(int width, int height, List<String> keywords) {
+  String _imageUrl(int width, int height, List<String> keywords, [bool random = false]) {
     var url = 'https://source.unsplash.com';
 
     url += '/${width}x${height}';
@@ -30,9 +33,15 @@ class Image {
           RegExp(r'^([A-Za-z0-9].+,[A-Za-z0-9]+)$|^([A-Za-z0-9]+)$');
       if (keywords.any(keywordFormat.hasMatch)) {
         url += '?' + keywords.join(',');
+        if(random){
+          url = url += '&random=${Random().nextInt(100) + 1}';
+        }
+      }
+    }else{
+      if(random){
+        url = url += '?random=${Random().nextInt(100) + 1}';
       }
     }
-
     return url;
   }
 }