Fixed iot_backend example

[singledigit]

Issue #, if available:
#1058

Description of changes:
Updated function event properties to remove 'AwsIotSqlVersion' property. Also removed key: id from Table as it will be auto created. Updated to nodejs10.x

Description of how you validated changes:

sam validate -t template.yaml

Checklist:

• [na ] 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 #1059 into develop will decrease coverage by 0.11%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1059      +/-   ##
===========================================
- Coverage    94.92%   94.81%   -0.12%     
===========================================
  Files           69       69              
  Lines         3250     3276      +26     
  Branches       632      639       +7     
===========================================
+ Hits          3085     3106      +21     
- Misses          87       89       +2     
- Partials        78       81       +3

Impacted Files	Coverage Δ
samtranslator/swagger/swagger.py	95.68% <0%> (-1.28%)	⬇️
...lator/plugins/application/serverless_app_plugin.py	83.44% <0%> (ø)	⬆️
samtranslator/model/api/api_generator.py	96.66% <0%> (+0.02%)	⬆️
samtranslator/model/apigateway.py	97.79% <0%> (+0.06%)	⬆️

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[jlhood]

I'm generally fine with most of the changes, but I'd prefer to leave the AwsIotSqlVersion property in the example.

[singledigit]

Updated and pushed for review

[jlhood]

Really appreciate you updating this! One thing to note: the latest released SAM CLI (v0.19.0) still hits a validation error on this template, but it's because of a known issue that will be fixed in the next SAM CLI release. I verified on a development build of SAM CLI that validate succeeds on this template with your changes.