src: rename namespace as chronochat

Change-Id: Idf390b1b2047c912735014d078ce099cf95026e6
diff --git a/src/endorse-extension.proto b/src/endorse-extension.proto
index 5db625c..2cee133 100644
--- a/src/endorse-extension.proto
+++ b/src/endorse-extension.proto
@@ -1,10 +1,10 @@
-package Chronos;
+package chronochat;
 
 message EndorseExtensionMsg
 {
   message EndorseEntry
   {
     required string name = 1;
-  }	
+  }
   repeated EndorseEntry endorseEntry = 1;
 }
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