The original author of a MIT-licensed project "merged" a large set of changes I authored, which included an addition of my name to the copyright line of the license. Later on, the original author removed my name, because we had a disagreement and he decided my name shouldn't be there since he never explicitly authorized the addition. The catch is that, although he removed my name, he added "all contributors" to the copyright line. Is the removal of my name legal?
edit: I should also note that the original author acknowledged me as co-author of the project after my large contribution (I have historical proof of this).