feat: add checking for older GIDs (#496)

* feat: add new games.extra.old_id

* add extra.old_id; standard release_year

* add option dontCheckOldIDs

* update naming, README, CHANGELOG

* Update CONTRIBUTING.md

* fix games.js

* add tool for checking duplicates

* update GAMES_LIST

* fix anchor links

* fix notes in generated game list

* Update GAMES_LIST.md

* Update GAMES_LIST.md

* add Game Object Example in CONTRIBUTING

* Update find_id_duplicates.js

* check skipOldIDs only once

* remove old ids; tweaks GAMES_LIST

* add MIGRATION document WIP

* Update GAMES_LIST.md

* update Halo Online name

* revert changes tool/generate

* remove extra line

* Update GAMES_LIST.md

* roll back GAME_LIST

* Update GAMES_LIST.md

* OMG

* WAT

* ok... hopefully the last change

* Update GAMES_LIST.md

* add MIGRATION ids

* roll back CONTRIBUTING

* Update CHANGELOG.md

* update skipOldIDs to checkOldIDs

* Update MIGRATION.md

* add migration note on README

README.md

@@ -8,6 +8,9 @@ If a server makes its status publically available, GameDig can fetch it for you.
 
 Support is available on the [Discord](https://discord.gg/NVCMn3tnxH) for questions, or [GitHub](https://github.com/gamedig/node-gamedig/issues) for bugs.
 
+## Migration from v4 to v5
+Game Type IDs have been updated in GameDig v5. Make sure to check if your game's ID is in the [migration document](MIGRATION.md).
+
 ## Games List
 **node-GameDig** can query over 310 games + a few services!  
 See the [GAMES_LIST.md](GAMES_LIST.md) file for the currently supported titles, not yet supported titles and notes about some of them.