Update analytics.dart (#78)

Author: eliasyishak

pkgs/unified_analytics/lib/src/analytics.dart

@@ -8,6 +8,7 @@ import 'package:file/file.dart';
 import 'package:file/local.dart';
 import 'package:file/memory.dart';
 import 'package:http/http.dart';
+import 'package:intl/date_symbol_data_local.dart';
 import 'package:meta/meta.dart';
 import 'package:path/path.dart' as p;
 
@@ -291,6 +292,10 @@ class AnalyticsImpl implements Analytics {
     required gaClient,
     bool pddFlag = false,
   }) : _gaClient = gaClient {
+    // Initialize date formatting for `package:intl` within constructor
+    // so clients using this package won't need to
+    initializeDateFormatting();
+
     // This initializer class will let the instance know
     // if it was the first run; if it is, nothing will be sent
     // on the first run