Added Keybase (#371)

* Added Keybase 5.4.2.1 x64 manifest.

* Fixed line endings.

* Removed silent switches, testing to see manifest validation error in GH.

* Reverted to CRLF.

* Changed encoding to UTF-8.

* Added back the silent switches.

* Added Plex Media Player.

* Delete 1.10.0.1208.yaml

manifests/Keybase/Keybase/5.4.2.1.yaml

@@ -0,0 +1,18 @@
+Id: Keybase.Keybase
+Version: 5.4.2.1
+Name: Keybase
+Publisher: Keybase, Inc.
+License: BSD 3-Clause
+LicenseUrl: https://github.com/keybase/client/blob/master/LICENSE
+AppMoniker: keybase
+Tags: gpg
+Description: End-to-end encryption for things that matter. Keybase is secure messaging and file-sharing.
+Homepage: https://keybase.io
+Installers:
+  - Arch: x64
+    Url: https://prerelease.keybase.io/keybase_setup_amd64.msi
+    Sha256: F1C74CBCC82ABF3743A7334575616F3CC724ADBCD12C44DA9A235E43E060BE92
+    InstallerType: msi
+    Switches:
+      Silent: /quiet
+      SilentWithProgress: /quiet