Remove ngrok binary
Remove ngrok binary

The `ngrok` file was the full ngrok binary, runnable on OS X.
Since ngrok is usually installed via package manager, remove the file.

It was committed (presumably accidentally) in
2a5aea136f8f0408d8d2d26cb9acd1d19f420dfe.

thoughtbot/beggar,thoughtbot/pester,thoughtbot/beggar,thoughtbot/pester,thoughtbot/beggar,thoughtbot/pester,thoughtbot/beggar