Add changelog entry

CHANGELOG

@@ -1,6 +1,10 @@
 # Changes for liblsl 1.14
 
 * **change**: CMake doesn't set `CMAKE_INSTALL_PREFIX`and `CMAKE_BUILD_TYPE` by default unless `LSL_COMFY_DEFAULTS` is set (Tristan Stenner)
+* change: object handles in the C++ API use smart pointers internally.
+  The smart pointer to the object can be retrieved with the `handle()` function
+* **change**: The `stream_info` copy constructor creates a shallow copy.
+  Use `stream_info::clone()` for the previous behavior (deep copy).
 * fix: prevent race condition when two threads modify an overflowing buffer (https://github.com/sccn/liblsl/pull/71, Jérémy Frey)
 * fix: improve latency and CPU usage (https://github.com/sccn/liblsl/pull/71, Jérémy Frey)
 * fix: various build system fixces and improvments (Chadwick Boulay, Tristan Stenner)