The only reason we included a license is because we wanted it to be easier for more people to use/share this. Some places (i.e. Curse) need some form of "official" notice allowing content to be used. Since we were making a license anyway, we thought it would be nice to add an attribution clause so others didn't try to claim our work as their own. The result is this custom license based on a combination of the MIT license and a couple parts from Vaskii's Botania/Psi license:

Copyright (c) 2017 All The Mods Team

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

You must give appropriate credit to the "All The Mods Team" as original 
creators for any parts of this Software being used. A link back to original 
content is optional but would be greatly appreciated. 

It is forbidden to charge for access to the distribution of this Software or 
gain money through it. This includes any type of inline advertisement, such 
as url shorteners (adf.ly or otherwise) or ads. This also includes 
restricting any amount of access behind a paywall. Special permission is 
given to allow this Software to be bundled or distributed with projects on 
Curse.com, CurseForge.com or their related sub-domains and subsidiaries.

Derivative works must be open source (have its source visible and allow for 
redistribution and modification).

The above copyright notice and conditions must be included in all copies or 
substantial portions of the Software, including derivative works and 
re-licensing thereof. 

DISCLAIMERS

"All The Mods Team" is not affiliated with "Mojang," "Oracle," "Curse," "Twitch," "Sponge," "Forge" or any other entity (or entity owning a referenced product) potentially mentioned in this document or relevant source code for this Software. The use of their names and/or trademarks is strictly circumstantial and assumed fair-use. All credit for their respective works, software, branding, copyrights and/or trademarks belongs entirely to them as original owners/licensers.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.