refactor: use timeago package

lib/utils/timeago.dart

@@ -1,31 +0,0 @@
-import 'dart:core';
-
-class TimeAgo {
-  static String _ceil(double n) => n.ceil().toString();
-
-  static String _pluralize(double time, String unit) {
-    if (time == 1) {
-      return '${_ceil(time)} $unit ago';
-    }
-    return '${_ceil(time)} ${unit}s ago';
-  }
-
-  static String formatFromString(String str) {
-    return format(DateTime.parse(str));
-  }
-
-  static String format(DateTime time) {
-    double diff =
-        (DateTime.now().millisecondsSinceEpoch - time.millisecondsSinceEpoch) /
-            1000;
-    if (diff < 0) {
-      return 'in the future';
-    } else if (diff < 3600) {
-      return _pluralize(diff / 60, 'minute');
-    } else if (diff < 86400) {
-      return _pluralize(diff / 3600, 'hour');
-    } else {
-      return _pluralize(diff / 86400, 'day');
-    }
-  }
-}

lib/utils/utils.dart

@@ -4,7 +4,6 @@ import 'package:flutter/gestures.dart';
 import '../providers/settings.dart';
 import '../screens/repo.dart';
 export 'package:flutter_vector_icons/flutter_vector_icons.dart';
-export 'timeago.dart';
 
 class StorageKeys {
   static const account = 'account';

lib/widgets/comment_item.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_markdown/flutter_markdown.dart';
+import 'package:timeago/timeago.dart' as timeago;
 import 'package:primer/primer.dart';
 import '../utils/utils.dart';
 import 'avatar.dart';
@@ -53,7 +54,7 @@ class CommentItem extends StatelessWidget {
                 UserName(payload['author']['login']),
                 Padding(padding: EdgeInsets.only(bottom: 2)),
                 Text(
-                  TimeAgo.formatFromString(payload['createdAt']),
+                  timeago.format(DateTime.parse(payload['createdAt'])),
                   style: TextStyle(color: Colors.black54, fontSize: 13),
                 ),
               ],

lib/widgets/notification_item.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter/cupertino.dart';
+import 'package:timeago/timeago.dart' as timeago;
 import 'package:primer/primer.dart';
 import 'package:url_launcher/url_launcher.dart';
 import '../utils/utils.dart';
@@ -36,7 +37,7 @@ class NotificationPayload {
     }
 
     title = input['subject']['title'];
-    updateAt = TimeAgo.formatFromString(input['updated_at']);
+    updateAt = timeago.format(DateTime.parse(input['updated_at']));
     unread = input['unread'];
   }
 }