output of command 'dart pub upgrade' updated (#2834)

* Issue 2801 output of dart pub upgrade changed from pub outdated to dart pub outdated

* Issue 2801 output of dart pub upgrade changed from pub outdated to dart pub outdated 2
diff --git a/lib/src/solver/report.dart b/lib/src/solver/report.dart
index 649a109..360fa4f 100644
--- a/lib/src/solver/report.dart
+++ b/lib/src/solver/report.dart
@@ -152,7 +152,7 @@
         packageCountString = '$outdatedPackagesCount packages have';
       }
       log.message('$packageCountString newer versions incompatible with '
-          'dependency constraints.\nTry `pub outdated` for more information.');
+          'dependency constraints.\nTry `dart pub outdated` for more information.');
     }
   }
 
diff --git a/test/test_pub.dart b/test/test_pub.dart
index a63048d..dfef189 100644
--- a/test/test_pub.dart
+++ b/test/test_pub.dart
@@ -89,7 +89,7 @@
   static final upgrade = RunCommand('upgrade', RegExp(r'''
 (No dependencies changed\.|Changed \d+ dependenc(y|ies)!)($|
 \d+ packages? (has|have) newer versions incompatible with dependency constraints.
-Try `pub outdated` for more information.$)'''));
+Try `dart pub outdated` for more information.$)'''));
   static final downgrade = RunCommand('downgrade',
       RegExp(r'(No dependencies changed\.|Changed \d+ dependenc(y|ies)!)$'));
   static final remove = RunCommand(
diff --git a/test/upgrade/report/shows_pub_outdated_test.dart b/test/upgrade/report/shows_pub_outdated_test.dart
index 1b2c2e5..6104fc5 100644
--- a/test/upgrade/report/shows_pub_outdated_test.dart
+++ b/test/upgrade/report/shows_pub_outdated_test.dart
@@ -41,7 +41,7 @@
     // Upgrade everything.
     await pubUpgrade(output: RegExp(r'''
 3 packages have newer versions incompatible with dependency constraints.
-Try `pub outdated` for more information.$''', multiLine: true));
+Try `dart pub outdated` for more information.$''', multiLine: true));
 
     // Upgrade `multiple_newer` to `1.0.1`.
     await d.appDir({
@@ -56,7 +56,7 @@
     // Upgrade everything.
     await pubUpgrade(output: RegExp(r'''
 2 packages have newer versions incompatible with dependency constraints.
-Try `pub outdated` for more information.$''', multiLine: true));
+Try `dart pub outdated` for more information.$''', multiLine: true));
 
     // Upgrade `multiple_newer` to `1.0.2-unstable.1`.
     await d.appDir({
@@ -71,7 +71,7 @@
     // Upgrade everything.
     await pubUpgrade(output: RegExp(r'''
 3 packages have newer versions incompatible with dependency constraints.
-Try `pub outdated` for more information.$''', multiLine: true));
+Try `dart pub outdated` for more information.$''', multiLine: true));
 
     // Upgrade all except `one_newer_stable`.
     await d.appDir({
@@ -86,6 +86,6 @@
     // Upgrade everything.
     await pubUpgrade(output: RegExp(r'''
 1 package has newer versions incompatible with dependency constraints.
-Try `pub outdated` for more information.$''', multiLine: true));
+Try `dart pub outdated` for more information.$''', multiLine: true));
   });
 }