最近遇到push到gitHub遇到"this exceeds GitHub's file size limit of 100 MB"这个问题，网上查看后发现这是gitHub的一个机制，我们上传的库文件大于50M时，上传就会警告，大于100M，就会直接拒绝，那么如何来解决这个问题呢，官网上一个方法：
git rm --cached giant_file
# Stage our giant file for removal, but leave it on disk
git commit --amend -CHEAD
# Amend the previous commit with your change
# Simply making a new commit won't work, as you need
# to remove the file from the unpushed history as well
git push
# Push our rewritten, smaller commit