Extract parsing arguments into separated function

[Abdujabbar]

Hello!

Just reviewed the source, and want to suggest, it would be better to manage if we can separate process of parsing arguments into a separate function.

https://github.com/azimjohn/jprq/blob/master/cli/main.go#L31-L70

method: parse_args - which would be parse arguments and will return a dictionary like in the python parse_args function, or raises an exception:

https://docs.python.org/3/library/argparse.html?highlight=argparse#module-argparse

[azimjohn]

PR please!

[Abdujabbar]

@azimjohn Ok, let I will do it. Thanks