src: rename namespace as chronochat

Change-Id: Idf390b1b2047c912735014d078ce099cf95026e6
diff --git a/src/invitation.cpp b/src/invitation.cpp
index 97b3855..f311ad0 100644
--- a/src/invitation.cpp
+++ b/src/invitation.cpp
@@ -14,7 +14,7 @@
 
 #include "logging.h"
 
-namespace chronos{
+namespace chronochat {
 
 using std::string;
 
@@ -76,4 +76,4 @@
 {
 }
 
-} // namespace chronos
+} // namespace chronochat