misc: rename namespace jami to namespace dhtnet

Change-Id: I904ec8fa1f35dfdcf1aabd5f1ec8d95989ad0696
diff --git a/src/peer_connection.cpp b/src/peer_connection.cpp
index a2c0615..42bfbc0 100644
--- a/src/peer_connection.cpp
+++ b/src/peer_connection.cpp
@@ -444,4 +444,4 @@
     return {};
 }
 
-} // namespace jami
+} // namespace dhtnet