Update changelog

Author: varsill

CHANGELOG.md

@@ -3,7 +3,8 @@
 ## Latest
 * Improve remove_link action docs
 * Deprecate `:components` option for `:unsafely_name_processes_for_observer`
-* Deprecate `:links` option for `:unsafely_name_processes_for_observer` in favour of `:report_links_to_observer` configuration entry 
+* Deprecate `:links` option for `:unsafely_name_processes_for_observer` in favour of `:report_links_to_observer` configuration entry
+* [Set label](https://hexdocs.pm/elixir/Process.html#set_label/1) for all the Membrane processes (i.e. for both Membrane components like pipelines, elements and bins and for utility components like subprocess supervisors)
 
 ## 1.2.6
  * Add tutorials [#1007](https://github.com/membraneframework/membrane_core/pull/1007), plugins [#1012](https://github.com/membraneframework/membrane_core/pull/1012) and demos [#1013](https://github.com/membraneframework/membrane_core/pull/1013) to the docs.