mark 2020.09 as unreleased in the CHANGELOG

2020-07-12 21:23:03 +02:00 · 2020-07-12 21:23:03 +02:00 · a345a7acfb
--- a/2
+++ b/2
@ -1,3 +1,5 @@
+Version 2020.09 (unreleased)
+
 Version 2020.07 (2020-07-12)
  Friendica Core:
    Update to the translations: DE, EN GB, EN US, FR, ET, NL, PL, RU, ZH-CN [translation teams]