Update hello-world

[tianon]

Changes:

• docker-library/hello-world@a6fdcbf: Add "ltsc2019" tag to example Windows one-liner (added tag to hello-world example for windows hello-world#85)
• docker-library/hello-world@92f8ec3: Merge pull request Fix line endings on Windows with gitattributes hello-world#80 from infosiftr/gitattributes
• docker-library/hello-world@93e0c55: Fix line endings on Windows with gitattributes
• docker-library/hello-world@9ef4804: Merge pull request Add initial GitHub Actions CI hello-world#73 from docker-library/github-actions
• docker-library/hello-world@bf64724: Add initial GitHub Actions CI

[github-actions]

Diff for 70ae7c3:

diff --git a/_bashbrew-cat b/_bashbrew-cat
index 48d3692..f5bc9ed 100644
--- a/_bashbrew-cat
+++ b/_bashbrew-cat
@@ -26,5 +26,5 @@ Tags: nanoserver-1809
 SharedTags: nanoserver, latest
 Architectures: windows-amd64
 windows-amd64-Directory: amd64/hello-world/nanoserver-1809
-windows-amd64-GitCommit: 9c93e37114a7fe99b5fc0d776e0b8dff99cbbb75
+windows-amd64-GitCommit: a6fdcbffb08c09e63c48cda1878e15fefcb6460a
 Constraints: nanoserver-1809
diff --git a/hello-world_nanoserver-1809/hello.txt b/hello-world_nanoserver-1809/hello.txt
index b55b070..92f4af7 100644
--- a/hello-world_nanoserver-1809/hello.txt
+++ b/hello-world_nanoserver-1809/hello.txt
@@ -12,7 +12,7 @@ To generate this message, Docker took the following steps:
     to your terminal.
 
 To try something more ambitious, you can run a Windows Server container with:
- PS C:\> docker run -it mcr.microsoft.com/windows/servercore powershell
+ PS C:\> docker run -it mcr.microsoft.com/windows/servercore:ltsc2019 powershell
 
 Share images, automate workflows, and more with a free Docker ID:
  https://hub.docker.com/