Update WhatsApp to 2.2037.6 (#3677)

manifests/WhatsApp/WhatsApp/2.2037.6.yaml

@@ -0,0 +1,16 @@
+Id: WhatsApp.WhatsApp
+Version: 2.2037.6
+Name: WhatsApp
+Publisher: WhatsApp
+License: Copyright (c) 2020 WhatsApp
+LicenseUrl: https://www.whatsapp.com/legal
+AppMoniker: whatsapp
+Description: Simple. Secure. Reliable messaging. With WhatsApp, you'll get fast, simple, secure messaging and calling for free*, available on phones all over the world.
+Homepage: https://www.whatsapp.com/
+Installers:
+  - Arch: x64
+    Url: https://web.whatsapp.com/desktop/windows/release/x64/WhatsAppSetup.exe
+    Sha256: 7E0712423D40B1710EDF104461AA5F27F692FFC320CA48EF3319A21B3BFA1468
+    InstallerType: exe
+    Switches:
+      Silent: "--silent"