src: rename namespace as chronochat

Change-Id: Idf390b1b2047c912735014d078ce099cf95026e6
diff --git a/src/endorse-collection.proto b/src/endorse-collection.proto
index 7aa1af8..f989516 100644
--- a/src/endorse-collection.proto
+++ b/src/endorse-collection.proto
@@ -1,4 +1,4 @@
-package chronos;
+package chronochat;
 
 message EndorseCollection
 {