Update flutter version details

Author: hillelcoren

lib/flutter_version.dart

@@ -1,10 +1,10 @@
 const FLUTTER_VERSION = const <String, String>{
-  "frameworkVersion": "1.26.0-17.2.pre",
-  "channel": "dev",
-  "repositoryUrl": "[email protected]:flutter/flutter.git",
-  "frameworkRevision": "79b49b9e1057f90ebf797725233c6b311722de69",
-  "frameworkCommitDate": "2021-02-03 15:33:39 -0800",
-  "engineRevision": "2c527d6c7e70e2f51bca1a46f1174b250f84c5da",
-  "dartSdkVersion": "2.12.0 (build 2.12.0-259.8.beta)",
-  "flutterRoot": "C:\\Users\\hillel\\Documents\\flutter"
+  'frameworkVersion': '1.26.0-17.2.pre',
+  'channel': 'dev',
+  'repositoryUrl': '[email protected]:flutter/flutter.git',
+  'frameworkRevision': '79b49b9e1057f90ebf797725233c6b311722de69',
+  'frameworkCommitDate': '2021-02-03 15:33:39 -0800',
+  'engineRevision': '2c527d6c7e70e2f51bca1a46f1174b250f84c5da',
+  'dartSdkVersion': '2.12.0 (build 2.12.0-259.8.beta)',
+  'flutterRoot': 'C:\\Users\\hillel\\Documents\\flutter'
 };