remote: error: GH001: Large files detected. You may want to try Git Large File Storage - https://git-lfs.github.com.

git filter-branch -f --index-filter 'git rm --cached --ignore-unmatch <path of the file>'

or if you have a large file you want to delete use 

git stash 
git stash applygit filter-branch -f --index-filter 'git rm --cached --ignore-unmatch fixtures/11_user_answer.json'