Updating DiagnosticSource to latest version

[eddynaka]

Fix Issue # .

Changes

(Please provide a brief description of the changes here.)

Checklist

• I ran Unit Tests locally.
• CHANGELOG.md updated with one line description of the fix, and a link to the original issue if available.

For significant contributions please make sure you have completed the following items:

• Design discussion issue #
• Changes in public surface reviewed

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Notes for authors:

• FxCop and other analyzers will fail the build. To see these errors yourself, compile localy using the Release configuration.

Notes for reviewers:

• We support comment build triggers
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  • /AzurePipelines run <pipeline-name> will queue a specific build

[cijothomas]

/azurepipelines run

[cijothomas]

/AzurePipelines run

[cijothomas]

changelog can be corrected to say rc2

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).