BFG Repo-Cleaner 
Removes large or troublesome blobs like git-filter-branch does, but faster - and written in Scala - Fund the BFG
$ bfg --strip-blobs-bigger-than 1M --replace-text banned.txt repo.git
The BFG is a simpler, faster (10 - 720x faster)
alternative to git-filter-branch for cleansing bad data out of your Git repository:
- Removing Crazy Big Files
- Removing Passwords, Credentials & other Private data
Main documentation for The BFG is here : https://rtyley.github.io/bfg-repo-cleaner/