Fixes for Valheim (#143)

* Fix Jotunn mod install
* Fix Valheim Bepinex install: +changelog.txt

Author: ZashIn

games/game_valheim.py

@@ -320,6 +320,7 @@ def init(self, organizer: mobase.IOrganizer) -> bool:
                     "start_game_bepinex.sh",
                     "start_server_bepinex.sh",
                     "winhttp.dll",
+                    "changelog.txt",
                     #
                     "InSlimVML",
                     "valheim_Data",
@@ -343,6 +344,7 @@ def init(self, organizer: mobase.IOrganizer) -> bool:
                     "*_VML.dll": "InSlimVML/Mods/",
                     #
                     "plugins": "BepInEx/",
+                    "Jotunn": "BepInEx/plugins/",
                     "*.dll": "BepInEx/plugins/",
                     "*.xml": "BepInEx/plugins/",
                     "config": "BepInEx/",