Corrects serveral minor issues in README.md

Initially it refers to the bot as `bot.py`, when the file is
  `cloudbot.py`. This has been amended.

Additionally, the installation for pip requires sudo rights for two
  of the three specified commands, otherwise it will trigger an error.
  This has been properly marked with `[sudo]`.

Please note that I am unfamiliar with how the pip installation works 
  on windows, so if the correction to use sudo was invalid, please
  comment. That said, the installation triggered a few errors when
  not running in sudo, but I may be entirely wrong on this, as I am
  not strongly familiar with `pip`.