Update proto client to support patch set replacments

Signed-off-by: Shawn O. Pearce <sop@google.com>
diff --git a/codereview/__init__.py b/codereview/__init__.py
index d991afa..8221688 100644
--- a/codereview/__init__.py
+++ b/codereview/__init__.py
@@ -1 +1 @@
-__version__ = 'v1.0-69-gd1f8508c'
+__version__ = 'v1.0-99-g9cd3ea2f'