[omemo] Update doc to Gitlab

omemo/manifest.ini

@@ -2,7 +2,7 @@
 name: OMEMO
 short_name: omemo
 version: 2.6.74
-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 dependencies, detailed in the installation instructions for your system in the GitHub wiki.
+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 dependencies, detailed in the installation instructions for your system in the GitLab wiki.
 authors: Bahtiar `kalkin-` Gadimov <bahtiar@gadimov.de>
  Daniel Gultsch <daniel@gultsch.de>
  Philipp Hörist <philipp@hoerist.com>

omemo/plugin.py

@@ -40,7 +40,7 @@ from omemo.backend.aes import aes_encrypt_file
 
 AXOLOTL_MISSING = 'You are missing Python3-Axolotl or use an outdated version'
 PROTOBUF_MISSING = "OMEMO can't import Google Protobuf, you can find help in " \
-                   "the GitHub Wiki"
+                   "the GitLab Wiki"
 ERROR_MSG = ''