Remove the list

[Fokko]

Description of Change

No need to construct a list. Found this when debugging some code

Assumptions

Replace this text with any assumptions made (if any)

Checklist for All Submissions

• I have added change info to CHANGES.rst
• If this is resolving an issue (needed so future developers can determine if change is still necessary and under what conditions) (can be provided via link to issue with these details):
  • Detailed description of issue
  • Alternative methods considered (if any)
  • How issue is being resolved
  • How issue can be reproduced
• If this is providing a new feature (can be provided via link to issue with these details):
  • Detailed description of new feature
  • Why needed
  • Alternatives methods considered (if any)

Checklist when updating botocore and/or aiohttp versions

• I have read and followed CONTRIBUTING.rst
• I have updated test_patches.py where/if appropriate (also check if no changes necessary)
• I have ensured that the awscli/boto3 versions match the updated botocore version

[codecov]

Codecov Report

Merging #969 (53a4480) into master (fbfeb12) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #969   +/-   ##
=======================================
  Coverage   86.77%   86.77%           
=======================================
  Files          55       55           
  Lines        5322     5322           
=======================================
  Hits         4618     4618           
  Misses        704      704           

Flag	Coverage Δ
unittests	86.77% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
aiobotocore/config.py	100.00% <100.00%> (ø)

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