Typos, add LuckPerms and EssentialsX, other fixes (MilkBowl#724)

* Typos, add LuckPerms and EssentialsX, other fixes

Fixed some typos, added LuckPerms and EssentialsX to the supported plugins, added links to some more plugins, updated license year, and some other small changes.

* Fixed the license starting year.

README.md

@@ -41,7 +41,7 @@ So, what features do I _think_ you'll like the most?
    - Determines if a player should recieve the update notices
 
 ## License
-Copyright (C) 2011 Morgan Humes <[email protected]>
+Copyright (C) 2011-2018 Morgan Humes <[email protected]>
 
 Vault is free software: you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License as published by
@@ -108,10 +108,11 @@ Github and we'll get to it at our convenience.
    - bPermissions 2 (http://dev.bukkit.org/server-mods/bpermissions/)
    - DroxPerms
    - Group Manager (Essentials) (http://forums.bukkit.org/threads/15312/)
+   - LuckPerms (https://www.spigotmc.org/resources/luckperms-an-advanced-permissions-plugin.28140/)
    - OverPermissions (http://dev.bukkit.org/bukkit-plugins/overpermissions/)
    - Permissions 3 (http://forums.bukkit.org/threads/18430/)
    - PermissionsBukkit
-   - Permissions Ex (http://forums.bukkit.org/threads/18140/)
+   - Permissions Ex (PEX) (http://forums.bukkit.org/threads/18140/)
    - Privileges
    - rscPermissions
    - SimplyPerms
@@ -122,13 +123,14 @@ Github and we'll get to it at our convenience.
 
 * Chat
    - bPermissions
-   - Group Manager (Essentials)
+   - Group Manager (Essentials) (http://forums.bukkit.org/threads/15312/)
    - iChat
+   - LuckPerms (https://www.spigotmc.org/resources/luckperms-an-advanced-permissions-plugin.28140/)
    - mChat
    - mChatSuite
-   - OverPermissions
-   - Permissions3
-   - PEX
+   - OverPermissions (http://dev.bukkit.org/bukkit-plugins/overpermissions/)
+   - Permissions 3 (http://forums.bukkit.org/threads/18430/)
+   - Permissions Ex (PEX) (http://forums.bukkit.org/threads/18140/)
    - rscPermissions
-   - TotalPermissions
+   - TotalPermissions (http://dev.bukkit.org/bukkit-mods/totalpermissions)
    - zPermissions