patch fix for Release v1.13.2

[praneetap]

Issue #, if available:
#191
Description of changes:
creating a release branch for v1.13.2. This has the fix for the issue seen in v1.13.0 where adding OpenApiVersion flag to the template did not cause the APIGW APIs to get redeployed in some cases. More in this comment

Description of how you validated changes:
make pr
Checklist:

• Write/update tests
• make pr passes
• Update documentation
• Verify transformed template deploys and application functions as expected
• Add/update example to examples/2016-10-31

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 #1061 into release/v1.13.2 will increase coverage by <.01%.
The diff coverage is 100%.

@@                 Coverage Diff                 @@
##           release/v1.13.2    #1061      +/-   ##
===================================================
+ Coverage            94.86%   94.87%   +<.01%     
===================================================
  Files                   69       69              
  Lines                 3156     3161       +5     
  Branches               602      603       +1     
===================================================
+ Hits                  2994     2999       +5     
  Misses                  84       84              
  Partials                78       78

Impacted Files	Coverage Δ
samtranslator/model/api/api_generator.py	95.33% <100%> (ø)	⬆️
samtranslator/model/apigateway.py	97.79% <100%> (+0.06%)	⬆️
samtranslator/__init__.py	100% <100%> (ø)	⬆️

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[jlhood]

Please use git cherry-pick from commits on latest develop branch to pull in the changes.

[jlhood]

Looks good!