SnowplowTracker::Emitter: Make the logger configurable via a :logger option

[mcls]

Currently the logger is always hard-coded and logs to STDERR. This change allows it to be configured.

PS: I also overwrite the logger in tests now, so that the output is clean and I've removed some leftover puts statements that were committed.

[coveralls]

Coverage increased (+0.2%) to 95.011% when pulling f026b68 on mcls:mcls/config-logger into 39fcfa2 on snowplow:master.

[BenFradet]

Thanks 👍

[mscwilson]

Hello again @mcls. Both of your commits in this PR have been cherry-picked into the release branch for our next release, v0.7.0.

Again, thanks for your much appreciated contribution, and apologies for taking so long to merge your work in.

[mcls]

Ok, thanks!

…

On Mon, 13 Sep 2021, 17:24 Miranda Wilson, ***@***.***> wrote: Hello again @mcls <https://github.com/mcls>. Both of your commits in this PR have been cherry-picked into the release branch for our next release, v0.7.0. Again, thanks for your much appreciated contribution, and apologies for taking so long to merge your work in. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#109 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAFOP3RLS7DEHNP2JSJQQFDUBYJTBANCNFSM4G5A3IFA> .