Fix changelog

[laurenyu]

Description of changes:
I may have merged a PR a little too quickly without checking the changelog properly.

Merge Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your pull request.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have updated the changelog with a description of my changes (if appropriate)
• I have updated any necessary documentation (if appropriate)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #483 into master will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #483      +/-   ##
=========================================
- Coverage   93.94%   93.8%   -0.14%     
=========================================
  Files          58      58              
  Lines        4329    4329              
=========================================
- Hits         4067    4061       -6     
- Misses        262     268       +6

Impacted Files	Coverage Δ
src/sagemaker/local/image.py	88.08% <0%> (-1.89%)	⬇️

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