Update CHANGELOG & manifest.ini

omemo/CHANGELOG

+1.2.4 / 2017-07-19
+- Fix LMC in Groupchat
+
 1.2.3 / 2017-07-13
 - Bug fix
 

omemo/manifest.ini

 [info]
 name: OMEMO
 short_name: omemo
-version: 1.2.3
+version: 1.2.4
 description: OMEMO is an XMPP Extension Protocol (XEP) for secure multi-client end-to-end encryption based on Axolotl and PEP. You need to install some dependencys, you can find install instructions for your system in the Gitlab Wiki.
 authors: Bahtiar `kalkin-` Gadimov <bahtiar@gadimov.de>
  Daniel Gultsch <daniel@gultsch.de>