Update intl pubspec for new analyzer version

pkg/intl/lib/extract_messages.dart

Index: pkg/intl/lib/extract_messages.dart
diff --git a/pkg/intl/lib/extract_messages.dart b/pkg/intl/lib/extract_messages.dart
index b140dfb46218dd12edf930d3ee8474a2b2d415c2..8a6ad529ec09ffde15c899115227fef1abf949a7 100644
--- a/pkg/intl/lib/extract_messages.dart
+++ b/pkg/intl/lib/extract_messages.dart
@@ -147,7 +147,9 @@ class MessageFindingVisitor extends GeneralizingASTVisitor {
    */
   void visitMethodDeclaration(MethodDeclaration node) {
     parameters = node.parameters;
-    if (parameters == null) parameters = new FormalParameterList(null, [], null, null, null);
+    if (parameters == null) {
+      parameters = new FormalParameterList(null, [], null, null, null);
+    }
     name = node.name.name;
     super.visitMethodDeclaration(node);
   }
@@ -158,7 +160,9 @@ class MessageFindingVisitor extends GeneralizingASTVisitor {
    */
   void visitFunctionDeclaration(FunctionDeclaration node) {
     parameters = node.functionExpression.parameters;
-    if (parameters == null) parameters = new FormalParameterList(null, [], null, null, null);
+    if (parameters == null) {
+      parameters = new FormalParameterList(null, [], null, null, null);
+    }
     name = node.name.name;
     super.visitFunctionDeclaration(node);
   }