libcomcat search function does not return same results as web API

[good-kiwi]

Describe the bug
Using the libcomcat search function for events that occurred from the year 1600 to 1900 of magnitude 6.0 or greater returns exactly 1 result. However, the web API query with the same parameters returns 101 events.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://earthquake.usgs.gov/fdsnws/event/1/query?format=xml&starttime=1600-01-01&endtime=1900-01-01&minmagnitude=6 . The XML file returns 101 event entries
2. import the libcomcat search function and run the following code:
   summary_events = search(starttime=datetime(1600, 1, 1),
   endtime=datetime(1900, 1, 1),
   minmagnitude=6.0)
3. See error python returns
   time location ... longitude magnitude
   0 1868-04-04 10:57:00 Maui region, Hawaii ... -156.5 6.5
   [1 rows x 6 columns]

while web query shows 101 events

Expected behavior
I expected the libcomcat search function to return the same results as the webquery.

Screenshots
Not applicable

Environmnet (please complete the following information):

• OS: Windows
• Python Version: 3.8
• Libcomcat Version 2.0.5
• Numpy Version 1.19.1

Additional context
None