Add a SHA-1 checksum for repo 1.19

Change-Id: Ice984a036832ce45ef085ee01ba6a4f1cb19685c
diff --git a/src/source/downloading.md b/src/source/downloading.md
index 72dffee..923d3c9 100644
--- a/src/source/downloading.md
+++ b/src/source/downloading.md
@@ -34,6 +34,8 @@
 
  - For version 1.17, the SHA-1 checksum for repo is
  ddd79b6d5a7807e911b524cb223bc3544b661c28
+ - For version 1.19, the SHA-1 checksum for repo is
+ 92cbad8c880f697b58ed83e348d06619f8098e6c
 
 
 ## Initializing a Repo client ##