Fixed typos, changed packet lossing to packet loss

[MyGodItsFull0fStars]

Hey Alexey and Jaime,

first of all, I really like your tool.

I saw some typos in the README and thought I will quickly fix them and send you a PR. I wasn't entirely sure about the usage of 'packet lossing', because 'packet loss' is the more common term AND if you want to keep the term as is, you have to omit the second 's' in lossing.

Kind Regards, Chris