increment ynh version

to test upgrades

manifest.toml

@@ -6,7 +6,7 @@ id = "flohmarkt"
 name = "flohmarkt"
 description.en = "A decentral federated small ads platform"
 
-version = "0.0~ynh1"
+version = "0.0~ynh2"
 
 maintainers = ["Chris Vogel"]