Update the SHA-1 for repo.

Add the version numbers, so that when repo gets updated people
get slightly less surprised.

Bug: http://b.android.com/29305
Change-Id: I227525e68c742e988d27feed650da863f4121618
diff --git a/src/source/downloading.md b/src/source/downloading.md
index f039591..d76e86c 100644
--- a/src/source/downloading.md
+++ b/src/source/downloading.md
@@ -32,7 +32,11 @@
         $ curl https://dl-ssl.google.com/dl/googlesource/git-repo/repo > ~/bin/repo
         $ chmod a+x ~/bin/repo
 
- - The SHA-1 checksum for repo is 29ba4221d4fccdfa8d87931cd73466fdc24040b5
+ - For version 1.15, the SHA-1 checksum for repo is
+ 8eb56d98b36d615c3efec51868e87bebe757feb1
+
+ - For version 1.16, the SHA-1 checksum for repo is
+ f3bfa7fd2d0a44aa40579bb0242cc20df37b5e17
 
 
 ## Initializing a Repo client ##