Replace Fprintf by just Fprint

[sayboras]

Description

Fixes eksctl-io/eksctl#836

Approach

This issue happens if the log message is have special character %. As we already performed formating in https://github.com/kris-nova/logger/blob/master/logger.go#L51, we don't need to use Fprintf again.

Note

I also take this chance to add go.mod file for this library as well

[sayboras]

@kris-nova for your input and review once you have time, thanks a lot 👍

[martina-if]

Hi @kris-nova , we use this fantastic logger in eksctl and would love to have this small fix. Can you please take a look when you have some time?

[krisnova]

Hey sorry i literally just saw this

Please let me know who else I can make a maintainer here so they can have merge access (twitter or kubernetes slack... or most folks at AWS know how to get a hold of me)

I will be pushing some changes soon - and I will add these tests to the 2.0 release to make sure we preserve backwards compatibility