removes diff stat of binary files (shown as "BIN") at "file changes" in GitHub.

github-diff-exclude-binary.js

Array.from(
  document.getElementsByClassName('js-diff-progressive-container')
)
.forEach(container => {
  Array.from(
    container.getElementsByClassName('Details')
  )
  .forEach(detail => {
    if (detail.getElementsByClassName('diffstat')[0].innerHTML.match(/BIN/)) {
      detail.parentNode.removeChild(detail)
    }
  })
})