Renamed the project from "Salut à Toi" to "Libervia":

This renaming follows the decision taken at the General Assemblee of January 27th 2021 (cf.
https://repos.goffi.org/sat_docs/raw-file/tip/association/2021-01-27%20-%20compte%20rendu%20de%20l%27AG%20extraordinaire.pdf)

CHANGELOG

@@ -1,6 +1,7 @@
 All theses changelogs are not exhaustive, please check the Mercurial repository for more details.
 
 v 0.8.0 « La Cecília » (NOT RELEASED YET):
+    - renamed the project from "Salut à Toi" to "Libervia"
     - Python 3 port
     - OMEMO for MUCs (group chat)
     - aesgcm schema handling (aka OMEMO Media Sharing)
@@ -21,6 +22,7 @@ v 0.8.0 « La Cecília » (NOT RELEASED YET):
     - list of interests: unique ID per location, to avoid duplicates
     - settings for themes in template engine
     - launching scripts are now in Python instead of shell scripts
+    - D-Bus bridge: renamed namespace from org.salutatoi.SAT to org.libervia.Libervia
     - Cagou:
         - new "share" widget
         - URIs can now be clicked to open a suitable application