Fix get_events filtering

[henrylamchan]

Don't actually need to wrap the input in list()... it would actually break things in this case as it turns out something like list('abc') results in ['a', 'b', 'c'].

For requests, we can actually pass in the input as is because a string and a single element array are represented the same way by python requests. 'foo' and ['foo'] would be transformed into /events?group=foo.

[codecov]

Codecov Report

Merging #34 into master will not change coverage.
The diff coverage is 12.50%.

@@           Coverage Diff           @@
##           master      #34   +/-   ##
=======================================
  Coverage   93.53%   93.53%           
=======================================
  Files          12       12           
  Lines         232      232           
=======================================
  Hits          217      217           
  Misses         15       15           

Impacted Files	Coverage Δ
workos/audit_trail.py	82.14% <0.00%> (ø)
workos/__about__.py	100.00% <100.00%> (ø)

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