(GH-265) Mention how to auto confirm prompts

Most folks have a hard time reading the manual. Let's give them a help
out so we can stop answering the same question over and over and over
and ...well you get the idea.

src/chocolatey/infrastructure.app/services/PowershellService.cs

@@ -217,6 +217,8 @@ public bool run_action(ChocolateyConfiguration configuration, PackageResult pack
                 {
                     this.Log().Info(ChocolateyLoggers.Important, () => "The package {0} wants to run '{1}'.".format_with(package.Id, _fileSystem.get_file_name(chocoPowerShellScript)));
                     this.Log().Info(ChocolateyLoggers.Important, () => "Note: If you don't run this script, the installation will fail.");
+                    this.Log().Info(ChocolateyLoggers.Important, () => @"Note: To confirm automatically next time, use '-y' or consider setting 
+ 'allowGlobalConfirmation'. Run 'choco feature -h' for more details.");
 
                     var selection = InteractivePrompt.prompt_for_confirmation(@"Do you want to run the script?", new[] {"yes", "no", "print"}, defaultChoice: null, requireAnswer: true);