Remove unneeded string concatination

[Fokko]

Description of Change

Replace this text with why this change is required and how it was accomplished

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 #1035 (24c3951) into master (6b328f4) will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1035      +/-   ##
==========================================
+ Coverage   86.15%   86.20%   +0.05%     
==========================================
  Files          58       58              
  Lines        5736     5736              
==========================================
+ Hits         4942     4945       +3     
+ Misses        794      791       -3     

Flag	Coverage Δ
unittests	86.20% <ø> (+0.05%)	⬆️

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see 2 files with indirect coverage changes

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