misc: rename namespace jami to namespace dhtnet

Change-Id: I904ec8fa1f35dfdcf1aabd5f1ec8d95989ad0696
diff --git a/src/peer_connection.h b/src/peer_connection.h
index 962e8d0..143ca70 100644
--- a/src/peer_connection.h
+++ b/src/peer_connection.h
@@ -134,4 +134,4 @@
     std::unique_ptr<Impl> pimpl_;
 };
 
-} // namespace jami
+} // namespace dhtnet