Logger plugin makes library un-usable for some users

[pselle]

From a user report, having the Logger plugin bundled in the kitchen sink is causing errors in invocation.

[INFO]    2018-07-12T21:28:47.687Z    8fb92fb0-861a-11e8-8d8d-3b2ad23ab021    Resetting dropped connection: metrics-api.iopipe.com
[ERROR]    2018-07-12T21:29:03.28Z    8fb92fb0-861a-11e8-8d8d-3b2ad23ab021    400 Client Error: Bad Request
Traceback (most recent call last):
File "/var/task/iopipe/contrib/logger/request.py", line 29, in upload_log_data
response.raise_for_status()
File "/var/runtime/botocore/vendored/requests/models.py", line 851, in raise_for_status
raise HTTPError(http_error_msg, response=self)
botocore.vendored.requests.exceptions.HTTPError: 400 Client Error: Bad Request