fix to argparse for example syntax 

I noticed a simple error that I wanted to correct in the way that the example argparse ran. When you run eyepea_monitoring_agent without any args you receive the help documents, but the example syntax did not match the arguments that need to provided per argparse. I am watching this repo closely and I would love to use it to monitor my own servers. If I can help in any way please let me know, this is my first pull request ever so if its not exactly correct please let me know how to do it the correct way.

Thanks