style: Format using dart format

lib/src/protobuf/omemo_authenticated_message.dart

@@ -2,12 +2,11 @@ import 'package:omemo_dart/src/helpers.dart';
 import 'package:omemo_dart/src/protobuf/protobuf.dart';
 
 class OmemoAuthenticatedMessage {
-
   OmemoAuthenticatedMessage();
 
   factory OmemoAuthenticatedMessage.fromBuffer(List<int> data) {
     var i = 0;
-    
+
     // required bytes mac     = 1;
     if (data[0] != fieldId(1, fieldTypeByteArray)) {
       throw Exception();
@@ -24,7 +23,7 @@ class OmemoAuthenticatedMessage {
       ..mac = mac
       ..message = message;
   }
-  
+
   List<int>? mac;
   List<int>? message;
 

lib/src/protobuf/omemo_key_exchange.dart

@@ -46,7 +46,7 @@ class OmemoKeyExchange {
       ..ek = ek
       ..message = message;
   }
-  
+
   int? pkId;
   int? spkId;
   List<int>? ik;

lib/src/protobuf/omemo_message.dart

@@ -2,12 +2,11 @@ import 'package:omemo_dart/src/helpers.dart';
 import 'package:omemo_dart/src/protobuf/protobuf.dart';
 
 class OmemoMessage {
-
   OmemoMessage();
 
   factory OmemoMessage.fromBuffer(List<int> data) {
     var i = 0;
-    
+
     // required uint32 n          = 1;
     if (data[0] != fieldId(1, fieldTypeUint32)) {
       throw Exception();

lib/src/protobuf/protobuf.dart

@@ -13,7 +13,6 @@ int fieldId(int number, int type) {
 }
 
 class VarintDecode {
-
   const VarintDecode(this.n, this.length);
   final int n;
   final int length;