Add comment to control dartfmt of boundary characters

Author: donny-dont

lib/src/request.dart

@@ -188,7 +188,6 @@ class Request extends Message {
         updatedContext);
   }
 
-
   /// All character codes that are valid in multipart boundaries.
   ///
   /// This is the intersection of the characters allowed in the `bcharsnospace`
@@ -198,10 +197,10 @@ class Request extends Message {
   /// [RFC 2046]: http://tools.ietf.org/html/rfc2046#section-5.1.1.
   /// [RFC 1521]: https://tools.ietf.org/html/rfc1521#section-4
   static const List<int> _boundaryCharacters = const <int>[
-    43, 95, 45, 46, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
-    65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83,
-    84, 85, 86, 87, 88, 89, 90, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106,
-    107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121,
+    43, 95, 45, 46, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 65, 66, 67, 68, //
+    69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, //
+    87, 88, 89, 90, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107,     //
+    108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121,   //
     122
   ];