Hide console output

[santoshjoseph99]

When using the API, I think it would be good idea not to output anything to the console, since you get that data from the start call.
Seems pretty simple, just pass a flag into the options object to silence the console.log's.
I can get this done if needed.

output when using API:

Config / CLI options

Steps to reproduce.

Stack trace

Screenshot

Environment

1. pwmetrics version:
2. Chrome version:
3. OS version:

[denar90]

I think we can use flag her, aka showLaunchingResults which might be true by default. wdyt?

[santoshjoseph99]

sounds good. I'll submit a PR.

[denar90]

fixed via #185