Sure, just write in description on credits that i made the breaking progres

if you unzip the folder and open pack.mcmeta and change "pack_format":4, to "pack_format":6, then it will register as a 1.16.x pack and thus will not show a warning.

Alternatively, if you don't have the software to open .mcmeta, delete pack.mcmeta and create a new text document and paste this into it:
{
  "pack": {
    "pack_format": 6,
    "description": "[Type a description here]"
  }
}
Save the text document as pack.mcmeta* in the Rainbow Breaking Progress folder (Should still have pack.png and a folder called assets).

* make sure you have a setting called "Show file extensions" on (on Windows; I don't know about equivalents for Mac or Linux etc), otherwise it will save itself as pack.mcmeta.txt.

When you refresh your in-game resource packs folder, it should show up without a warning.

:)

This 1.14 version will work on 1.16.4 just ignore this warning about older version of minecraft

Sorry that so long i haven't looked hire for some time