src: rename namespace as chronochat

Change-Id: Idf390b1b2047c912735014d078ce099cf95026e6
diff --git a/src/endorse-info.proto b/src/endorse-info.proto
index 41aa6f2..b1657d6 100644
--- a/src/endorse-info.proto
+++ b/src/endorse-info.proto
@@ -1,4 +1,4 @@
-package Chronos;
+package chronochat;
 
 message EndorseInfo
 {