v4.20.0 - Bug fixes & multiple NPCs for a conversation

[AlessioGr]

ATTENTION: VERSION 3 AND OLDER ARE NOT COMPATIBLE. ⇒ [Updating from <v4 guide](https://www.notquests.com/docs/documentation/updating-from-v3-or-older/).

• [+] Add ability to add multiple NPCs to a Conversation
• [!] Fix protection plugins not being respected
• [!] [Prevent ConcurrentModificationException when looping through active quests

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This discussion was created from the release v4.20.0 - Bug fixes & multiple NPCs for a conversation.