change email address of old git commits.sh

# rewrites history!
# finish using 'git push --force origin master'

git filter-branch -f --commit-filter '
  if [ "$GIT_COMMITTER_NAME" = "Jamie Wilkinson" ]; then
    GIT_COMMITTER_NAME="Jamie Wilkinson";
    GIT_AUTHOR_NAME="Jamie Wilkinson";
    GIT_COMMITTER_EMAIL="[email protected]";
    GIT_AUTHOR_EMAIL="[email protected]";
    git commit-tree "$@";  
  else
    git commit-tree "$@";
  fi' HEAD