mettre à jour CHANGES.md au lieu de le réécrire complètement

bash/src/pman.sh

@@ -409,10 +409,6 @@ function _rscript_create_release_branch() {
 ## Release $Tag du $date
 "
     _list_commits | _filter_changes | _format_md >>"$changelog"
-    if [ -s CHANGES.md ]; then
-        echo >>"$changelog"
-        cat CHANGES.md >>"$changelog"
-    fi
     "${EDITOR:-nano}" +7 "$changelog"
     [ -s "$changelog" ] || exit_with ewarn "Création de la release annulée"
 
@@ -423,11 +419,18 @@ EOF
 
     # créer le changelog
     _scripta "update CHANGES.md" <<EOF
+tmpchanges=/tmp/pman_CHANGES.$$.md
 $(qvals echo "$(awk <"$changelog" '
 BEGIN { p = 0 }
 p == 0 && $0 == "" { p = 1; next }
 p == 1 { print }
-')") >CHANGES.md
+')") >"\$tmpchanges"
+if [ -s CHANGES.md ]; then
+  echo >>"\$tmpchanges"
+  cat CHANGES.md >>"\$tmpchanges"
+fi
+cat "\$tmpchanges" >CHANGES.md
+rm -f "\$tmpchanges"
 git add CHANGES.md
 EOF