Added mime field to asset model

lib/src/model/asset.dart

@@ -9,6 +9,7 @@ part 'asset.g.dart';
 /// * [name]
 /// * [description]
 /// * [fid]
+/// * [mime]
 /// * [tags]
 @JsonSerializable()
 class Asset {
@@ -16,6 +17,7 @@ class Asset {
   final String name;
   final String description;
   final String fid;
+  final String mime;
   final String tags;
 
   const Asset(
@@ -23,6 +25,7 @@ class Asset {
       required this.name,
       required this.description,
       required this.fid,
+      required this.mime,
       required this.tags});
 
   factory Asset.fromJson(Map<String, dynamic> json) => _$AssetFromJson(json);

lib/src/model/asset.g.dart

@@ -11,6 +11,7 @@ Asset _$AssetFromJson(Map<String, dynamic> json) => Asset(
       name: json['name'] as String,
       description: json['description'] as String,
       fid: json['fid'] as String,
+      mime: json['mime'] as String,
       tags: json['tags'] as String,
     );
 
@@ -19,5 +20,6 @@ Map<String, dynamic> _$AssetToJson(Asset instance) => <String, dynamic>{
       'name': instance.name,
       'description': instance.description,
       'fid': instance.fid,
+      'mime': instance.mime,
       'tags': instance.tags,
     };