Document command-fifo in changelog

doc/pages/changelog.asciidoc

@@ -5,6 +5,9 @@ released versions.
 
 == Development version
 
+* command and response fifo support
+  (See <<expansions#command-and-response-fifo,`:doc expansions command-and-response-fifo`>>)
+
 * Shell expansions only trim the last trailing newline instead of all of
   them to make is possible to losslessly pass text through `%sh{...}`. 
 

src/main.cc

@@ -45,6 +45,7 @@ struct {
     StringView notes;
 } constexpr version_notes[] = { {
         0,
+        "» {+u}$kak_command_fifo{} support\n"
         "» {+u}set-option -remove{} support\n"
         "» prompts auto select {+i}menu{} completions on space\n"
         "» explicit completion support ({+b}<c-x>...{}) in prompts\n"